create table t1 (a int, b int, c int); create table t2 (a int, b int, c int, d decimal); insert into t1 values (1,21,345), (1,33,7), (8,33,114), (1,21,500), (1,19,107), (5,14,787), (8,33,123), (9,10,211), (5,16,207), (1,33,988), (5,27,132), (1,21,104), (6,20,309), (6,20,315), (1,21,101), (8,33,404), (9,10,800), (1,21,123), (7,11,708), (6,20,214); insert into t2 values (2,3,207,207.0000), (1,21,909,12.0000), (7,13,312,406.0000), (8,64,248,107.0000), (6,20,315,279.3333), (1,19,203,107.0000), (8,80,800,314.0000), (3,12,231,190.0000), (6,23,303,909.0000); Warnings: Note 1265 Data truncated for column 'd' at row 5 create table t1_double(a int, b double, c double); insert into t1_double values (1,23.4,14.3333), (1,12.5,18.9), (3,12.5,18.9), (4,33.4,14.3333), (4,14.3333,13.65), (5,17.89,7.22), (6,33.4,14.3), (10,33.4,13.65), (11,33.4,13.65); create table t2_double(a int, b double, c double); insert into t2_double values (1,22.4,14.3333), (1,12.5,18.9), (2,22.4,18.9), (4,33.4,14.3333), (5,22.4,13.65), (7,17.89,18.9), (6,33.4,14.3333), (10,31.4,13.65), (12,33.4,13.65); create table t1_char(a char, b char(8), c int); insert into t1_char values ('a','Ivan',1), ('b','Vika',2), ('b','Inga',6), ('c','Vika',7), ('b','Ivan',7), ('a','Alex',6), ('b','Inga',5), ('d','Ron',9), ('d','Harry',2), ('d','Hermione',3), ('c','Ivan',3), ('c','Harry',4); create table t2_char(a char, b char(8), c int); insert into t2_char values ('b','Ivan',1), ('c','Vinny',3), ('c','Inga',9), ('a','Vika',1), ('c','Ivan',2), ('b','Ali',6), ('c','Inga',2), ('a','Ron',9), ('d','Harry',1), ('b','Hermes',3), ('b','Ivan',11), ('b','Harry',4); create table t1_decimal (a decimal(3,1), b decimal(3,1), c int); insert into t1_decimal values (1,1,23),(2,2,11),(3,3,16), (1,1,12),(1,1,14),(2,3,15), (2,1,13),(2,3,11),(3,3,16); create table t2_decimal (a decimal(3,1), b decimal(3,1), c int); insert into t2_decimal values (2,1,13),(2,2,11),(3,3,16), (1,3,22),(1,3,14),(2,2,15), (2,1,43),(2,3,11),(2,3,16); create view v1 as select a, b, max(c) as max_c, avg(c) as avg_c from t1 group by a,b having max_c < 707; create view v2 as select a, b, max(c) as max_c, avg(c) as avg_c from t1 where t1.a>5 group by a,b having max_c < 707; create view v3 as select a, b, min(c) as min_c from t1 where t1.a<10 group by a,b having min_c > 109; create view v4 as select a, b, min(max_c) as min_c from v1 where (v1.a<15) group by a,b; create view v_union as select a, b, min(c) as c from t1 where t1.a<10 group by a,b having c > 109 union select a, b, max(c) as c from t1 where t1.b>10 group by a,b having c < 300; create view v2_union as select a, b, min(c) as c from t1 where t1.a<10 group by a,b having c > 109 union select a, b, max(c) as c from t1 where t1.b>10 group by a,b having c < 300 union select a, b, avg(c) as c from t1 where t1.c>300 group by a,b having c < 707; create view v3_union as select a, b, (a+1) as c from t1 where t1.a<10 union select a, b, c from t1 where t1.b>10 and t1.c>100; create view v4_union as select a, b, max(c)-100 as c from t1 where t1.a<10 group by a,b having c > 109 union select a, b, (c+100) as c from t1 where t1.b>10; create view v_double as select a, avg(a/4) as avg_a, b, c from t1_double where (b>12.2) group by b,c having (avg_a<22.333); create view v_char as select a, b, max(c) as max_c from t1_char group by a,b having max_c < 9; create view v_decimal as select a, b, avg(c) as avg_c from t1_decimal group by a,b having (avg_c>12); # conjunctive subformula : pushing into HAVING set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where (v1.max_c>214) and (t2.a>v1.a); a b max_c avg_c a b c d 1 21 500 234.6000 2 3 207 207 1 21 500 234.6000 7 13 312 406 1 21 500 234.6000 8 64 248 107 1 21 500 234.6000 6 20 315 279 1 21 500 234.6000 8 80 800 314 1 21 500 234.6000 3 12 231 190 1 21 500 234.6000 6 23 303 909 6 20 315 279.3333 7 13 312 406 6 20 315 279.3333 8 64 248 107 6 20 315 279.3333 8 80 800 314 select * from v1,t2 where (v1.max_c>214) and (t2.a>v1.a); a b max_c avg_c a b c d 1 21 500 234.6000 2 3 207 207 1 21 500 234.6000 7 13 312 406 1 21 500 234.6000 8 64 248 107 1 21 500 234.6000 6 20 315 279 1 21 500 234.6000 8 80 800 314 1 21 500 234.6000 3 12 231 190 1 21 500 234.6000 6 23 303 909 6 20 315 279.3333 7 13 312 406 6 20 315 279.3333 8 64 248 107 6 20 315 279.3333 8 80 800 314 explain select * from v1,t2 where (v1.max_c>214) and (t2.a>v1.a); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort explain format=json select * from v1,t2 where (v1.max_c>214) and (t2.a>v1.a); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.max_c > 214" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "t2.a > v1.a", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and max_c > 214", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 group by a,b having max_c < 707) v1, t2 where (v1.a=t2.a) and (v1.max_c>300); a b max_c avg_c a b c d 1 21 500 234.6000 1 21 909 12 8 33 404 213.6667 8 64 248 107 6 20 315 279.3333 6 20 315 279 1 21 500 234.6000 1 19 203 107 8 33 404 213.6667 8 80 800 314 6 20 315 279.3333 6 23 303 909 select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 group by a,b having max_c < 707) v1, t2 where (v1.a=t2.a) and (v1.max_c>300); a b max_c avg_c a b c d 1 21 500 234.6000 1 21 909 12 8 33 404 213.6667 8 64 248 107 6 20 315 279.3333 6 20 315 279 1 21 500 234.6000 1 19 203 107 8 33 404 213.6667 8 80 800 314 6 20 315 279.3333 6 23 303 909 explain select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 group by a,b having max_c < 707) v1, t2 where (v1.a=t2.a) and (v1.max_c>300); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 5 test.t2.a 2 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort explain format=json select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 group by a,b having max_c < 707) v1, t2 where (v1.a=t2.a) and (v1.max_c>300); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["a"], "ref": ["test.t2.a"], "rows": 2, "filtered": 100, "attached_condition": "v1.max_c > 300", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and max_c > 300", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } } } } # extracted or formula : pushing into HAVING set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where ((v1.max_c>400) and (t2.a>v1.a)) or ((v1.max_c<135) and (t2.a400) and (t2.a>v1.a)) or ((v1.max_c<135) and (t2.a400) and (t2.a>v1.a)) or ((v1.max_c<135) and (t2.a ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort explain format=json select * from v1,t2 where ((v1.max_c>400) and (t2.a>v1.a)) or ((v1.max_c<135) and (t2.a", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.max_c > 400 or v1.max_c < 135" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.max_c > 400 and t2.a > v1.a or v1.max_c < 135 and t2.a < v1.a", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and (max_c > 400 or max_c < 135)", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where ((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or ((v1.max_c<135) and (v1.max_c300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or ((v1.max_c<135) and (v1.max_c300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or ((v1.max_c<135) and (v1.max_c ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort explain format=json select * from v1,t2 where ((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or ((v1.max_c<135) and (v1.max_c", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.max_c > 300 or v1.max_c < 135" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.b = t2.b and v1.max_c > 300 and v1.avg_c > t2.d or v1.a = t2.a and v1.max_c < 135 and v1.max_c < t2.c", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and (max_c > 300 or max_c < 135)", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } } } } # conjunctive subformula : pushing into WHERE set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where (v1.a>6) and (t2.b>v1.b); a b max_c avg_c a b c d 8 33 404 213.6667 8 64 248 107 8 33 404 213.6667 8 80 800 314 select * from v1,t2 where (v1.a>6) and (t2.b>v1.b); a b max_c avg_c a b c d 8 33 404 213.6667 8 64 248 107 8 33 404 213.6667 8 80 800 314 explain select * from v1,t2 where (v1.a>6) and (t2.b>v1.b); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v1,t2 where (v1.a>6) and (t2.b>v1.b); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a > 6" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "t2.b > v1.b", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 6" } } } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v2,t2 where (v2.b>25) and (t2.a25) and (t2.a25) and (t2.a ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v2,t2 where (v2.b>25) and (t2.a", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v2.b > 25" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "t2.a < v2.a", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5 and t1.b > 25" } } } } } } } } # extracted or formula : pushing into WHERE set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where ((v1.a>7) and (t2.c7) and (t2.c7) and (t2.c ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v1,t2 where ((v1.a>7) and (t2.c", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a > 7 or v1.a < 2" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.a > 7 and t2.c < v1.max_c or v1.a < 2 and t2.b < v1.b", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 7 or t1.a < 2" } } } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v2,t2 where ((v2.a>7) and (t2.c5) and (t2.b7) and (t2.c5) and (t2.b7) and (t2.c5) and (t2.b ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v2,t2 where ((v2.a>7) and (t2.c5) and (t2.b", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v2.a > 7 or v2.a > 5" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v2.a > 7 and t2.c < v2.max_c or v2.a > 5 and t2.b < v2.b", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5 and (t1.a > 7 or t1.a > 5)" } } } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where ((v1.a>4) and (v1.b>t2.b) and (v1.max_c=t2.d)) or ((v1.a<2) and (v1.max_c4) and (v1.b>t2.b) and (v1.max_c=t2.d)) or ((v1.a<2) and (v1.max_c4) and (v1.b>t2.b) and (v1.max_c=t2.d)) or ((v1.a<2) and (v1.max_c ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v1,t2 where ((v1.a>4) and (v1.b>t2.b) and (v1.max_c=t2.d)) or ((v1.a<2) and (v1.max_c", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a > 4 or v1.a < 2" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.a > 4 and v1.b > t2.b and v1.max_c = t2.d or v1.a < 2 and v1.max_c < t2.c and v1.max_c = t2.d", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 4 or t1.a < 2" } } } } } } } } # conjunctive subformulas : pushing into HAVING and WHERE set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where (v1.a<2) and (v1.max_c>400) and (t2.b>v1.b); a b max_c avg_c a b c d 1 21 500 234.6000 8 64 248 107 1 21 500 234.6000 8 80 800 314 1 21 500 234.6000 6 23 303 909 select * from v1,t2 where (v1.a<2) and (v1.max_c>400) and (t2.b>v1.b); a b max_c avg_c a b c d 1 21 500 234.6000 8 64 248 107 1 21 500 234.6000 8 80 800 314 1 21 500 234.6000 6 23 303 909 explain select * from v1,t2 where (v1.a<2) and (v1.max_c>400) and (t2.b>v1.b); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v1,t2 where (v1.a<2) and (v1.max_c>400) and (t2.b>v1.b); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a < 2 and v1.max_c > 400" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "t2.b > v1.b", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and max_c > 400", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 2" } } } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v_double as v,t2_double as t where (v.a=t.a) and (v.avg_a>0.45) and (v.b>10); a avg_a b c a b c 1 0.50000000 12.5 18.9 1 22.4 14.3333 1 0.50000000 12.5 18.9 1 12.5 18.9 4 1.00000000 33.4 14.3333 4 33.4 14.3333 4 1.00000000 14.3333 13.65 4 33.4 14.3333 5 1.25000000 17.89 7.22 5 22.4 13.65 6 1.50000000 33.4 14.3 6 33.4 14.3333 10 2.62500000 33.4 13.65 10 31.4 13.65 select * from v_double as v,t2_double as t where (v.a=t.a) and (v.avg_a>0.45) and (v.b>10); a avg_a b c a b c 1 0.50000000 12.5 18.9 1 22.4 14.3333 1 0.50000000 12.5 18.9 1 12.5 18.9 4 1.00000000 33.4 14.3333 4 33.4 14.3333 4 1.00000000 14.3333 13.65 4 33.4 14.3333 5 1.25000000 17.89 7.22 5 22.4 13.65 6 1.50000000 33.4 14.3 6 33.4 14.3333 10 2.62500000 33.4 13.65 10 31.4 13.65 explain select * from v_double as v,t2_double as t where (v.a=t.a) and (v.avg_a>0.45) and (v.b>10); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 5 test.t.a 2 Using where 2 DERIVED t1_double ALL NULL NULL NULL NULL 9 Using where; Using temporary; Using filesort explain format=json select * from v_double as v,t2_double as t where (v.a=t.a) and (v.avg_a>0.45) and (v.b>10); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["a"], "ref": ["test.t.a"], "rows": 2, "filtered": 100, "attached_condition": "v.avg_a > 0.45 and v.b > 10", "materialized": { "query_block": { "select_id": 2, "having_condition": "avg_a < 22.333 and avg_a > 0.45", "filesort": { "sort_key": "t1_double.b, t1_double.c", "temporary_table": { "table": { "table_name": "t1_double", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t1_double.b > 12.2 and t1_double.b > 10" } } } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v_decimal as v,t2_decimal as t where (v.a=t.a) and (v.avg_c>15) and (v.b>1); a b avg_c a b c 3.0 3.0 16.0000 3.0 3.0 16 select * from v_decimal as v,t2_decimal as t where (v.a=t.a) and (v.avg_c>15) and (v.b>1); a b avg_c a b c 3.0 3.0 16.0000 3.0 3.0 16 explain select * from v_decimal as v,t2_decimal as t where (v.a=t.a) and (v.avg_c>15) and (v.b>1); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 3 test.t.a 2 Using where 2 DERIVED t1_decimal ALL NULL NULL NULL NULL 9 Using where; Using temporary; Using filesort explain format=json select * from v_decimal as v,t2_decimal as t where (v.a=t.a) and (v.avg_c>15) and (v.b>1); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "3", "used_key_parts": ["a"], "ref": ["test.t.a"], "rows": 2, "filtered": 100, "attached_condition": "v.avg_c > 15 and v.b > 1", "materialized": { "query_block": { "select_id": 2, "having_condition": "avg_c > 12 and avg_c > 15", "filesort": { "sort_key": "t1_decimal.a, t1_decimal.b", "temporary_table": { "table": { "table_name": "t1_decimal", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t1_decimal.b > 1" } } } } } } } } # extracted or formula : pushing into HAVING and WHERE set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where ((v1.a>7) and (v1.max_c>300) and (t2.c7) and (v1.max_c>300) and (t2.c7) and (v1.max_c>300) and (t2.c ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v1,t2 where ((v1.a>7) and (v1.max_c>300) and (t2.c", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a > 7 and v1.max_c > 300 or v1.a < 4 and v1.max_c < 500" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.a > 7 and v1.max_c > 300 and t2.c < v1.max_c or v1.a < 4 and v1.max_c < 500 and t2.b < v1.b", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and (t1.a > 7 and max_c > 300 or t1.a < 4 and max_c < 500)", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 7 or t1.a < 4" } } } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where ((v1.a<2) and (v1.max_c>120)) or (v1.a>7); a b max_c avg_c a b c d 1 21 500 234.6000 2 3 207 207 1 21 500 234.6000 1 21 909 12 1 21 500 234.6000 7 13 312 406 1 21 500 234.6000 8 64 248 107 1 21 500 234.6000 6 20 315 279 1 21 500 234.6000 1 19 203 107 1 21 500 234.6000 8 80 800 314 1 21 500 234.6000 3 12 231 190 1 21 500 234.6000 6 23 303 909 8 33 404 213.6667 2 3 207 207 8 33 404 213.6667 1 21 909 12 8 33 404 213.6667 7 13 312 406 8 33 404 213.6667 8 64 248 107 8 33 404 213.6667 6 20 315 279 8 33 404 213.6667 1 19 203 107 8 33 404 213.6667 8 80 800 314 8 33 404 213.6667 3 12 231 190 8 33 404 213.6667 6 23 303 909 select * from v1,t2 where ((v1.a<2) and (v1.max_c>120)) or (v1.a>7); a b max_c avg_c a b c d 1 21 500 234.6000 2 3 207 207 1 21 500 234.6000 1 21 909 12 1 21 500 234.6000 7 13 312 406 1 21 500 234.6000 8 64 248 107 1 21 500 234.6000 6 20 315 279 1 21 500 234.6000 1 19 203 107 1 21 500 234.6000 8 80 800 314 1 21 500 234.6000 3 12 231 190 1 21 500 234.6000 6 23 303 909 8 33 404 213.6667 2 3 207 207 8 33 404 213.6667 1 21 909 12 8 33 404 213.6667 7 13 312 406 8 33 404 213.6667 8 64 248 107 8 33 404 213.6667 6 20 315 279 8 33 404 213.6667 1 19 203 107 8 33 404 213.6667 8 80 800 314 8 33 404 213.6667 3 12 231 190 8 33 404 213.6667 6 23 303 909 explain select * from v1,t2 where ((v1.a<2) and (v1.max_c>120)) or (v1.a>7); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v1,t2 where ((v1.a<2) and (v1.max_c>120)) or (v1.a>7); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a < 2 and v1.max_c > 120 or v1.a > 7" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.a < 2 and v1.max_c > 120 or v1.a > 7", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and (t1.a < 2 and max_c > 120 or t1.a > 7)", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 2 or t1.a > 7" } } } } } } } } # extracted or formulas : pushing into WHERE and HAVING set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where ((v1.a<2) and (v1.max_c>120) and (v1.b=t2.b)) or (v1.a>7); a b max_c avg_c a b c d 1 21 500 234.6000 1 21 909 12 8 33 404 213.6667 2 3 207 207 8 33 404 213.6667 1 21 909 12 8 33 404 213.6667 7 13 312 406 8 33 404 213.6667 8 64 248 107 8 33 404 213.6667 6 20 315 279 8 33 404 213.6667 1 19 203 107 8 33 404 213.6667 8 80 800 314 8 33 404 213.6667 3 12 231 190 8 33 404 213.6667 6 23 303 909 select * from v1,t2 where ((v1.a<2) and (v1.max_c>120) and (v1.b=t2.b)) or (v1.a>7); a b max_c avg_c a b c d 1 21 500 234.6000 1 21 909 12 8 33 404 213.6667 2 3 207 207 8 33 404 213.6667 1 21 909 12 8 33 404 213.6667 7 13 312 406 8 33 404 213.6667 8 64 248 107 8 33 404 213.6667 6 20 315 279 8 33 404 213.6667 1 19 203 107 8 33 404 213.6667 8 80 800 314 8 33 404 213.6667 3 12 231 190 8 33 404 213.6667 6 23 303 909 explain select * from v1,t2 where ((v1.a<2) and (v1.max_c>120) and (v1.b=t2.b)) or (v1.a>7); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v1,t2 where ((v1.a<2) and (v1.max_c>120) and (v1.b=t2.b)) or (v1.a>7); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a < 2 and v1.max_c > 120 or v1.a > 7" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.b = t2.b and v1.a < 2 and v1.max_c > 120 or v1.a > 7", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and (t1.a < 2 and max_c > 120 or t1.a > 7)", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 2 or t1.a > 7" } } } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where ((v1.a<2) and (v1.max_c<200) and (t2.c>v1.max_c) and (v1.max_c=t2.d)) or ((v1.a>4) and (v1.max_c<500) and (t2.bv1.max_c) and (v1.max_c=t2.d)) or ((v1.a>4) and (v1.max_c<500) and (t2.bv1.max_c) and (v1.max_c=t2.d)) or ((v1.a>4) and (v1.max_c<500) and (t2.b ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v1,t2 where ((v1.a<2) and (v1.max_c<200) and (t2.c>v1.max_c) and (v1.max_c=t2.d)) or ((v1.a>4) and (v1.max_c<500) and (t2.b", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a < 2 and v1.max_c < 200 or v1.a > 4" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.a < 2 and v1.max_c < 200 and t2.c > v1.max_c and v1.max_c = t2.d or v1.max_c = t2.c and v1.a > 4 and t2.c < 500 and t2.b < v1.b", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and (t1.a < 2 and max_c < 200 or t1.a > 4 and max_c < 500)", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 2 or t1.a > 4" } } } } } } } } # prepare of a query containing extracted or formula prepare stmt from "select * from v1,t2 where ((v1.max_c>400) and (t2.a>v1.a)) or ((v1.max_c<135) and (t2.a400) and (t2.a>v1.a)) or ((v1.max_c<135) and (t2.a", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.max_c > 400 or v1.max_c < 135" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.max_c > 400 and t2.a > v1.a or v1.max_c < 135 and t2.a < v1.a", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and (max_c > 400 or max_c < 135)", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } } } } execute stmt; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.max_c > 400 or v1.max_c < 135" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.max_c > 400 and t2.a > v1.a or v1.max_c < 135 and t2.a < v1.a", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and (max_c > 400 or max_c < 135)", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } } } } deallocate prepare stmt; # conjunctive subformula : pushing into WHERE # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where (t2.a=v1.a) and (v1.b=t2.b) and (v1.a=1); a b max_c avg_c a b c d 1 21 500 234.6000 1 21 909 12 1 19 107 107.0000 1 19 203 107 select * from v1,t2 where (t2.a=v1.a) and (v1.b=t2.b) and (v1.a=1); a b max_c avg_c a b c d 1 21 500 234.6000 1 21 909 12 1 19 107 107.0000 1 19 203 107 explain select * from v1,t2 where (t2.a=v1.a) and (v1.b=t2.b) and (v1.a=1); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 5 test.t2.b 2 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v1,t2 where (t2.a=v1.a) and (v1.b=t2.b) and (v1.a=1); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a = 1 and t2.b is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["b"], "ref": ["test.t2.b"], "rows": 2, "filtered": 100, "attached_condition": "v1.a = 1", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a = 1" } } } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where (v1.a=5) and (v1.max_c=t2.d); a b max_c avg_c a b c d 5 16 207 207.0000 2 3 207 207 select * from v1,t2 where (v1.a=5) and (v1.max_c=t2.d); a b max_c avg_c a b c d 5 16 207 207.0000 2 3 207 207 explain select * from v1,t2 where (v1.a=5) and (v1.max_c=t2.d); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 5 test.t2.d 2 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v1,t2 where (v1.a=5) and (v1.max_c=t2.d); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.d is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["max_c"], "ref": ["test.t2.d"], "rows": 2, "filtered": 100, "attached_condition": "v1.a = 5 and v1.max_c = t2.d", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a = 5" } } } } } } } } # conjunctive subformula : pushing into WHERE using equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where (t2.a<5) and (v1.a=t2.a); a b max_c avg_c a b c d 1 21 500 234.6000 1 21 909 12 1 19 107 107.0000 1 21 909 12 1 21 500 234.6000 1 19 203 107 1 19 107 107.0000 1 19 203 107 select * from v1,t2 where (t2.a<5) and (v1.a=t2.a); a b max_c avg_c a b c d 1 21 500 234.6000 1 21 909 12 1 19 107 107.0000 1 21 909 12 1 21 500 234.6000 1 19 203 107 1 19 107 107.0000 1 19 203 107 explain select * from v1,t2 where (t2.a<5) and (v1.a=t2.a); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 5 test.t2.a 2 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v1,t2 where (t2.a<5) and (v1.a=t2.a); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a < 5 and t2.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["a"], "ref": ["test.t2.a"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 5" } } } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where (v1.a=v1.b) and (v1.a=t2.a); a b max_c avg_c a b c d select * from v1,t2 where (v1.a=v1.b) and (v1.a=t2.a); a b max_c avg_c a b c d explain select * from v1,t2 where (v1.a=v1.b) and (v1.a=t2.a); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 10 test.t2.a,test.t2.a 2 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v1,t2 where (v1.a=v1.b) and (v1.a=t2.a); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a is not null and t2.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "10", "used_key_parts": ["a", "b"], "ref": ["test.t2.a", "test.t2.a"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.b = t1.a" } } } } } } } } # conjunctive subformula : pushing into HAVING using equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where (t2.c>150) and (v1.max_c=t2.c); a b max_c avg_c a b c d 5 16 207 207.0000 2 3 207 207 6 20 315 279.3333 6 20 315 279 select * from v1,t2 where (t2.c>150) and (v1.max_c=t2.c); a b max_c avg_c a b c d 5 16 207 207.0000 2 3 207 207 6 20 315 279.3333 6 20 315 279 explain select * from v1,t2 where (t2.c>150) and (v1.max_c=t2.c); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 5 test.t2.c 2 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort explain format=json select * from v1,t2 where (t2.c>150) and (v1.max_c=t2.c); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.c > 150 and t2.c is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["max_c"], "ref": ["test.t2.c"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and max_c > 150", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } } } } # extracted and formula : pushing into WHERE # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where (v1.a=v1.b) and (v1.a=t2.a) and (v1.a=3); a b max_c avg_c a b c d select * from v1,t2 where (v1.a=v1.b) and (v1.a=t2.a) and (v1.a=3); a b max_c avg_c a b c d explain select * from v1,t2 where (v1.a=v1.b) and (v1.a=t2.a) and (v1.a=3); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where explain format=json select * from v1,t2 where (v1.a=v1.b) and (v1.a=t2.a) and (v1.a=3); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a = 3" }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a = 3 and v1.b = 3" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a = 3 and t1.b = 3" } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where (v1.a=1) and (v1.b=21) and (t2.a=2); a b max_c avg_c a b c d 1 21 500 234.6000 2 3 207 207 select * from v1,t2 where (v1.a=1) and (v1.b=21) and (t2.a=2); a b max_c avg_c a b c d 1 21 500 234.6000 2 3 207 207 explain select * from v1,t2 where (v1.a=1) and (v1.b=21) and (t2.a=2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where explain format=json select * from v1,t2 where (v1.a=1) and (v1.b=21) and (t2.a=2); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a = 2" }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a = 1 and v1.b = 21" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a = 1 and t1.b = 21" } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v_char as v,t2_char as t where (v.a='c') and (v.b<'Hermes') and ((v.b=t.b) or (v.max_c>20)); a b max_c a b c c Harry 4 d Harry 1 c Harry 4 b Harry 4 select * from v_char as v,t2_char as t where (v.a='c') and (v.b<'Hermes') and ((v.b=t.b) or (v.max_c>20)); a b max_c a b c c Harry 4 d Harry 1 c Harry 4 b Harry 4 explain select * from v_char as v,t2_char as t where (v.a='c') and (v.b<'Hermes') and ((v.b=t.b) or (v.max_c>20)); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY ALL NULL NULL NULL NULL 12 Using where 1 PRIMARY t ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1_char ALL NULL NULL NULL NULL 12 Using where; Using temporary; Using filesort explain format=json select * from v_char as v,t2_char as t where (v.a='c') and (v.b<'Hermes') and ((v.b=t.b) or (v.max_c>20)); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 12, "filtered": 100, "attached_condition": "v.a = 'c' and v.b < 'Hermes'", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 9", "filesort": { "sort_key": "t1_char.b", "temporary_table": { "table": { "table_name": "t1_char", "access_type": "ALL", "rows": 12, "filtered": 100, "attached_condition": "t1_char.a = 'c' and t1_char.b < 'Hermes'" } } } } } }, "block-nl-join": { "table": { "table_name": "t", "access_type": "ALL", "rows": 12, "filtered": 100 }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "t.b = v.b or v.max_c > 20" } } } # extracted and formula : pushing into WHERE using equalities # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v_decimal as v,t2_decimal as t where (v.a=v.b) and (v.b=t.b) and ((t.b>1) or (v.a=1)); a b avg_c a b c 1.0 1.0 16.3333 2.0 1.0 13 3.0 3.0 16.0000 3.0 3.0 16 3.0 3.0 16.0000 1.0 3.0 22 3.0 3.0 16.0000 1.0 3.0 14 1.0 1.0 16.3333 2.0 1.0 43 3.0 3.0 16.0000 2.0 3.0 11 3.0 3.0 16.0000 2.0 3.0 16 select * from v_decimal as v,t2_decimal as t where (v.a=v.b) and (v.b=t.b) and ((t.b>1) or (v.a=1)); a b avg_c a b c 1.0 1.0 16.3333 2.0 1.0 13 3.0 3.0 16.0000 3.0 3.0 16 3.0 3.0 16.0000 1.0 3.0 22 3.0 3.0 16.0000 1.0 3.0 14 1.0 1.0 16.3333 2.0 1.0 43 3.0 3.0 16.0000 2.0 3.0 11 3.0 3.0 16.0000 2.0 3.0 16 explain select * from v_decimal as v,t2_decimal as t where (v.a=v.b) and (v.b=t.b) and ((t.b>1) or (v.a=1)); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 6 test.t.b,test.t.b 2 2 DERIVED t1_decimal ALL NULL NULL NULL NULL 9 Using where; Using temporary; Using filesort explain format=json select * from v_decimal as v,t2_decimal as t where (v.a=v.b) and (v.b=t.b) and ((t.b>1) or (v.a=1)); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "(t.b > 1 or t.b = 1) and t.b is not null and t.b is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "6", "used_key_parts": ["a", "b"], "ref": ["test.t.b", "test.t.b"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 2, "having_condition": "avg_c > 12", "filesort": { "sort_key": "t1_decimal.a, t1_decimal.b", "temporary_table": { "table": { "table_name": "t1_decimal", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t1_decimal.b = t1_decimal.a and (t1_decimal.a > 1 or t1_decimal.a = 1)" } } } } } } } } # extracted or formula : pushing into HAVING using equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where ((t2.a<4) and (v1.a=t2.a)) or ((t2.c>150) and (v1.max_c=t2.c)); a b max_c avg_c a b c d 1 19 107 107.0000 1 21 909 12 1 19 107 107.0000 1 19 203 107 1 21 500 234.6000 1 21 909 12 1 21 500 234.6000 1 19 203 107 5 16 207 207.0000 2 3 207 207 6 20 315 279.3333 6 20 315 279 select * from v1,t2 where ((t2.a<4) and (v1.a=t2.a)) or ((t2.c>150) and (v1.max_c=t2.c)); a b max_c avg_c a b c d 1 19 107 107.0000 1 21 909 12 1 19 107 107.0000 1 19 203 107 1 21 500 234.6000 1 21 909 12 1 21 500 234.6000 1 19 203 107 5 16 207 207.0000 2 3 207 207 6 20 315 279.3333 6 20 315 279 explain select * from v1,t2 where ((t2.a<4) and (v1.a=t2.a)) or ((t2.c>150) and (v1.max_c=t2.c)); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort explain format=json select * from v1,t2 where ((t2.a<4) and (v1.a=t2.a)) or ((t2.c>150) and (v1.max_c=t2.c)); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a < 4 or t2.c > 150" }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100 }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.a = t2.a and t2.a < 4 or v1.max_c = t2.c and t2.c > 150", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and (t1.a < 4 or max_c > 150)", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } } } } # conjunctive subformulas : pushing into WHERE and HAVING using equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where ((t2.a>5) and (v1.a=t2.a)) and ((t2.c>250) and (v1.max_c=t2.c)); a b max_c avg_c a b c d 6 20 315 279.3333 6 20 315 279 select * from v1,t2 where ((t2.a>5) and (v1.a=t2.a)) and ((t2.c>250) and (v1.max_c=t2.c)); a b max_c avg_c a b c d 6 20 315 279.3333 6 20 315 279 explain select * from v1,t2 where ((t2.a>5) and (v1.a=t2.a)) and ((t2.c>250) and (v1.max_c=t2.c)); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 10 test.t2.a,test.t2.c 2 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v1,t2 where ((t2.a>5) and (v1.a=t2.a)) and ((t2.c>250) and (v1.max_c=t2.c)); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a > 5 and t2.c > 250 and t2.a is not null and t2.c is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "10", "used_key_parts": ["a", "max_c"], "ref": ["test.t2.a", "test.t2.c"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and max_c > 250", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5" } } } } } } } } # conjunctive subformulas : pushing into WHERE and HAVING # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 group by a,b having max_c < 707) v1, t2 where (v1.a=8) and (v1.a=t2.a) and (v1.max_c=404); a b max_c avg_c a b c d 8 33 404 213.6667 8 64 248 107 8 33 404 213.6667 8 80 800 314 select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 group by a,b having max_c < 707) v1, t2 where (v1.a=8) and (v1.a=t2.a) and (v1.max_c=404); a b max_c avg_c a b c d 8 33 404 213.6667 8 64 248 107 8 33 404 213.6667 8 80 800 314 explain select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 group by a,b having max_c < 707) v1, t2 where (v1.a=8) and (v1.a=t2.a) and (v1.max_c=404); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 group by a,b having max_c < 707) v1, t2 where (v1.a=8) and (v1.a=t2.a) and (v1.max_c=404); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a = 8" }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a = 8 and v1.max_c = 404" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c = 404", "filesort": { "sort_key": "t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a = 8" } } } } } } } } # conjunctive subformulas : pushing into WHERE and HAVING set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where (v1.a>3) and (v1.max_c>200) and (t2.b3) and (v1.max_c>200) and (t2.b3) and (v1.max_c>200) and (t2.b ref key0 key0 5 test.t2.d 2 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v1,t2 where (v1.a>3) and (v1.max_c>200) and (t2.b", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["max_c"], "ref": ["test.t2.d"], "rows": 2, "filtered": 100, "attached_condition": "v1.a > 3 and v1.max_c > 200 and t2.b < v1.b and t2.d = v1.max_c", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and max_c > 200", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 3" } } } } } } } } # conjunctive subformula : pushing into WHERE # extracted or formula : pushing into HAVING using equalities # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v_double as v,t2_double as t where (v.b=v.c) and (v.c=t.c) and ((t.c>10) or (v.a=1)); a avg_a b c a b c select * from v_double as v,t2_double as t where (v.b=v.c) and (v.c=t.c) and ((t.c>10) or (v.a=1)); a avg_a b c a b c explain select * from v_double as v,t2_double as t where (v.b=v.c) and (v.c=t.c) and ((t.c>10) or (v.a=1)); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 18 test.t.c,test.t.c 2 Using where 2 DERIVED t1_double ALL NULL NULL NULL NULL 9 Using where; Using temporary; Using filesort explain format=json select * from v_double as v,t2_double as t where (v.b=v.c) and (v.c=t.c) and ((t.c>10) or (v.a=1)); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t.c is not null and t.c is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "18", "used_key_parts": ["b", "c"], "ref": ["test.t.c", "test.t.c"], "rows": 2, "filtered": 100, "attached_condition": "t.c > 10 or v.a = 1", "materialized": { "query_block": { "select_id": 2, "having_condition": "avg_a < 22.333 and (t1_double.b > 10 or t1_double.a = 1)", "filesort": { "sort_key": "t1_double.b, t1_double.c", "temporary_table": { "table": { "table_name": "t1_double", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t1_double.c = t1_double.b and t1_double.b > 12.2" } } } } } } } } # conjunctive subformula : pushing into WHERE # extracted or formula : pushing into HAVING using equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v_double as v,t2_double as t where (((v.a>0.2) or (v.b<17)) or (t.c>17)) and (t.c=v.c) and (v.c>18); a avg_a b c a b c 1 0.50000000 12.5 18.9 1 12.5 18.9 1 0.50000000 12.5 18.9 2 22.4 18.9 1 0.50000000 12.5 18.9 7 17.89 18.9 select * from v_double as v,t2_double as t where (((v.a>0.2) or (v.b<17)) or (t.c>17)) and (t.c=v.c) and (v.c>18); a avg_a b c a b c 1 0.50000000 12.5 18.9 1 12.5 18.9 1 0.50000000 12.5 18.9 2 22.4 18.9 1 0.50000000 12.5 18.9 7 17.89 18.9 explain select * from v_double as v,t2_double as t where (((v.a>0.2) or (v.b<17)) or (t.c>17)) and (t.c=v.c) and (v.c>18); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 9 test.t.c 2 Using where 2 DERIVED t1_double ALL NULL NULL NULL NULL 9 Using where; Using temporary; Using filesort explain format=json select * from v_double as v,t2_double as t where (((v.a>0.2) or (v.b<17)) or (t.c>17)) and (t.c=v.c) and (v.c>18); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t.c > 18 and t.c is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "9", "used_key_parts": ["c"], "ref": ["test.t.c"], "rows": 2, "filtered": 100, "attached_condition": "v.a > 0.2 or v.b < 17 or t.c > 17", "materialized": { "query_block": { "select_id": 2, "having_condition": "avg_a < 22.333 and (t1_double.a > 0.2 or t1_double.b < 17 or t1_double.c > 17)", "filesort": { "sort_key": "t1_double.b, t1_double.c", "temporary_table": { "table": { "table_name": "t1_double", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t1_double.b > 12.2 and t1_double.c > 18" } } } } } } } } # extracted or formula : pushing into WHERE # conjunctive subformula : pushing into HAVING # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v_decimal as v,t2_decimal as t where (((v.a>4) or (v.a=2)) or (v.b>3)) and (v.avg_c=13); a b avg_c a b c 2.0 1.0 13.0000 2.0 1.0 13 2.0 3.0 13.0000 2.0 1.0 13 2.0 1.0 13.0000 2.0 2.0 11 2.0 3.0 13.0000 2.0 2.0 11 2.0 1.0 13.0000 3.0 3.0 16 2.0 3.0 13.0000 3.0 3.0 16 2.0 1.0 13.0000 1.0 3.0 22 2.0 3.0 13.0000 1.0 3.0 22 2.0 1.0 13.0000 1.0 3.0 14 2.0 3.0 13.0000 1.0 3.0 14 2.0 1.0 13.0000 2.0 2.0 15 2.0 3.0 13.0000 2.0 2.0 15 2.0 1.0 13.0000 2.0 1.0 43 2.0 3.0 13.0000 2.0 1.0 43 2.0 1.0 13.0000 2.0 3.0 11 2.0 3.0 13.0000 2.0 3.0 11 2.0 1.0 13.0000 2.0 3.0 16 2.0 3.0 13.0000 2.0 3.0 16 select * from v_decimal as v,t2_decimal as t where (((v.a>4) or (v.a=2)) or (v.b>3)) and (v.avg_c=13); a b avg_c a b c 2.0 1.0 13.0000 2.0 1.0 13 2.0 3.0 13.0000 2.0 1.0 13 2.0 1.0 13.0000 2.0 2.0 11 2.0 3.0 13.0000 2.0 2.0 11 2.0 1.0 13.0000 3.0 3.0 16 2.0 3.0 13.0000 3.0 3.0 16 2.0 1.0 13.0000 1.0 3.0 22 2.0 3.0 13.0000 1.0 3.0 22 2.0 1.0 13.0000 1.0 3.0 14 2.0 3.0 13.0000 1.0 3.0 14 2.0 1.0 13.0000 2.0 2.0 15 2.0 3.0 13.0000 2.0 2.0 15 2.0 1.0 13.0000 2.0 1.0 43 2.0 3.0 13.0000 2.0 1.0 43 2.0 1.0 13.0000 2.0 3.0 11 2.0 3.0 13.0000 2.0 3.0 11 2.0 1.0 13.0000 2.0 3.0 16 2.0 3.0 13.0000 2.0 3.0 16 explain select * from v_decimal as v,t2_decimal as t where (((v.a>4) or (v.a=2)) or (v.b>3)) and (v.avg_c=13); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY t ALL NULL NULL NULL NULL 9 Using join buffer (flat, BNL join) 2 DERIVED t1_decimal ALL NULL NULL NULL NULL 9 Using where; Using temporary; Using filesort explain format=json select * from v_decimal as v,t2_decimal as t where (((v.a>4) or (v.a=2)) or (v.b>3)) and (v.avg_c=13); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "(v.a > 4 or v.a = 2 or v.b > 3) and v.avg_c = 13", "materialized": { "query_block": { "select_id": 2, "having_condition": "avg_c > 12 and avg_c = 13", "filesort": { "sort_key": "t1_decimal.a, t1_decimal.b", "temporary_table": { "table": { "table_name": "t1_decimal", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t1_decimal.a > 4 or t1_decimal.a = 2 or t1_decimal.b > 3" } } } } } }, "block-nl-join": { "table": { "table_name": "t", "access_type": "ALL", "rows": 9, "filtered": 100 }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL" } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 where t1.a>5 group by a,b having max_c < 707) v1, t2 where (v1.a=t2.a) and (v1.max_c>300) and (v1.a=v1.b); a b max_c avg_c a b c d select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 where t1.a>5 group by a,b having max_c < 707) v1, t2 where (v1.a=t2.a) and (v1.max_c>300) and (v1.a=v1.b); a b max_c avg_c a b c d explain select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 where t1.a>5 group by a,b having max_c < 707) v1, t2 where (v1.a=t2.a) and (v1.max_c>300) and (v1.a=v1.b); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 10 test.t2.a,test.t2.a 2 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 where t1.a>5 group by a,b having max_c < 707) v1, t2 where (v1.a=t2.a) and (v1.max_c>300) and (v1.a=v1.b); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a is not null and t2.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "10", "used_key_parts": ["a", "b"], "ref": ["test.t2.a", "test.t2.a"], "rows": 2, "filtered": 100, "attached_condition": "v1.max_c > 300", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and max_c > 300", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.b = t1.a and t1.a > 5" } } } } } } } } # nothing to push set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where (t2.a<2) and (t2.c>900); a b max_c avg_c a b c d 1 19 107 107.0000 1 21 909 12 1 21 500 234.6000 1 21 909 12 5 16 207 207.0000 1 21 909 12 5 27 132 132.0000 1 21 909 12 6 20 315 279.3333 1 21 909 12 8 33 404 213.6667 1 21 909 12 select * from v1,t2 where (t2.a<2) and (t2.c>900); a b max_c avg_c a b c d 1 19 107 107.0000 1 21 909 12 1 21 500 234.6000 1 21 909 12 5 16 207 207.0000 1 21 909 12 5 27 132 132.0000 1 21 909 12 6 20 315 279.3333 1 21 909 12 8 33 404 213.6667 1 21 909 12 explain select * from v1,t2 where (t2.a<2) and (t2.c>900); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ALL NULL NULL NULL NULL 20 Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort explain format=json select * from v1,t2 where (t2.a<2) and (t2.c>900); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a < 2 and t2.c > 900" }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100 }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where (v1.a=t2.a) and (v1.b=t2.b); a b max_c avg_c a b c d 1 21 500 234.6000 1 21 909 12 6 20 315 279.3333 6 20 315 279 1 19 107 107.0000 1 19 203 107 select * from v1,t2 where (v1.a=t2.a) and (v1.b=t2.b); a b max_c avg_c a b c d 1 21 500 234.6000 1 21 909 12 6 20 315 279.3333 6 20 315 279 1 19 107 107.0000 1 19 203 107 explain select * from v1,t2 where (v1.a=t2.a) and (v1.b=t2.b); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 10 test.t2.a,test.t2.b 2 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort explain format=json select * from v1,t2 where (v1.a=t2.a) and (v1.b=t2.b); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a is not null and t2.b is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "10", "used_key_parts": ["a", "b"], "ref": ["test.t2.a", "test.t2.b"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where (t2.a=v1.a) or (v1.b=t2.b) and ((v1.a=1) or (v1.a=6)); a b max_c avg_c a b c d 1 19 107 107.0000 1 21 909 12 1 19 107 107.0000 1 19 203 107 1 21 500 234.6000 1 21 909 12 1 21 500 234.6000 1 19 203 107 6 20 315 279.3333 6 20 315 279 6 20 315 279.3333 6 23 303 909 8 33 404 213.6667 8 64 248 107 8 33 404 213.6667 8 80 800 314 select * from v1,t2 where (t2.a=v1.a) or (v1.b=t2.b) and ((v1.a=1) or (v1.a=6)); a b max_c avg_c a b c d 1 19 107 107.0000 1 21 909 12 1 19 107 107.0000 1 19 203 107 1 21 500 234.6000 1 21 909 12 1 21 500 234.6000 1 19 203 107 6 20 315 279.3333 6 20 315 279 6 20 315 279.3333 6 23 303 909 8 33 404 213.6667 8 64 248 107 8 33 404 213.6667 8 80 800 314 explain select * from v1,t2 where (t2.a=v1.a) or (v1.b=t2.b) and ((v1.a=1) or (v1.a=6)); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort explain format=json select * from v1,t2 where (t2.a=v1.a) or (v1.b=t2.b) and ((v1.a=1) or (v1.a=6)); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100 }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.a = t2.a or v1.b = t2.b and (v1.a = 1 or v1.a = 6)", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where (v1.a=1) or (v1.b=21) or (t2.a=2); a b max_c avg_c a b c d 1 19 107 107.0000 2 3 207 207 1 19 107 107.0000 1 21 909 12 1 19 107 107.0000 7 13 312 406 1 19 107 107.0000 8 64 248 107 1 19 107 107.0000 6 20 315 279 1 19 107 107.0000 1 19 203 107 1 19 107 107.0000 8 80 800 314 1 19 107 107.0000 3 12 231 190 1 19 107 107.0000 6 23 303 909 1 21 500 234.6000 2 3 207 207 1 21 500 234.6000 1 21 909 12 1 21 500 234.6000 7 13 312 406 1 21 500 234.6000 8 64 248 107 1 21 500 234.6000 6 20 315 279 1 21 500 234.6000 1 19 203 107 1 21 500 234.6000 8 80 800 314 1 21 500 234.6000 3 12 231 190 1 21 500 234.6000 6 23 303 909 5 16 207 207.0000 2 3 207 207 5 27 132 132.0000 2 3 207 207 6 20 315 279.3333 2 3 207 207 8 33 404 213.6667 2 3 207 207 select * from v1,t2 where (v1.a=1) or (v1.b=21) or (t2.a=2); a b max_c avg_c a b c d 1 19 107 107.0000 2 3 207 207 1 19 107 107.0000 1 21 909 12 1 19 107 107.0000 7 13 312 406 1 19 107 107.0000 8 64 248 107 1 19 107 107.0000 6 20 315 279 1 19 107 107.0000 1 19 203 107 1 19 107 107.0000 8 80 800 314 1 19 107 107.0000 3 12 231 190 1 19 107 107.0000 6 23 303 909 1 21 500 234.6000 2 3 207 207 1 21 500 234.6000 1 21 909 12 1 21 500 234.6000 7 13 312 406 1 21 500 234.6000 8 64 248 107 1 21 500 234.6000 6 20 315 279 1 21 500 234.6000 1 19 203 107 1 21 500 234.6000 8 80 800 314 1 21 500 234.6000 3 12 231 190 1 21 500 234.6000 6 23 303 909 5 16 207 207.0000 2 3 207 207 5 27 132 132.0000 2 3 207 207 6 20 315 279.3333 2 3 207 207 8 33 404 213.6667 2 3 207 207 explain select * from v1,t2 where (v1.a=1) or (v1.b=21) or (t2.a=2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort explain format=json select * from v1,t2 where (v1.a=1) or (v1.b=21) or (t2.a=2); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100 }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.a = 1 or v1.b = 21 or t2.a = 2", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where (t2.a<2) and (t2.c>900) and ((v1.a900) and ((v1.a900) and ((v1.a ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort explain format=json select * from v1,t2 where (t2.a<2) and (t2.c>900) and ((v1.a 900" }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100 }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.a < t2.a or t2.a < 11", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } } } } # using several derived tables : nothing to push set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,v2,t2 where (v1.a=v2.a) and (v1.a=t2.a) and (v2.b<50); a b max_c avg_c a b max_c avg_c a b c d 8 33 404 213.6667 8 33 404 213.6667 8 64 248 107 6 20 315 279.3333 6 20 315 279.3333 6 20 315 279 8 33 404 213.6667 8 33 404 213.6667 8 80 800 314 6 20 315 279.3333 6 20 315 279.3333 6 23 303 909 select * from v1,v2,t2 where (v1.a=v2.a) and (v1.a=t2.a) and (v2.b<50); a b max_c avg_c a b max_c avg_c a b c d 8 33 404 213.6667 8 33 404 213.6667 8 64 248 107 6 20 315 279.3333 6 20 315 279.3333 6 20 315 279 8 33 404 213.6667 8 33 404 213.6667 8 80 800 314 6 20 315 279.3333 6 20 315 279.3333 6 23 303 909 explain select * from v1,v2,t2 where (v1.a=v2.a) and (v1.a=t2.a) and (v2.b<50); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key1 key1 5 test.t2.a 2 1 PRIMARY ref key0 key0 5 test.t2.a 2 Using where 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort explain format=json select * from v1,v2,t2 where (v1.a=v2.a) and (v1.a=t2.a) and (v2.b<50); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a is not null and t2.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key1"], "key": "key1", "key_length": "5", "used_key_parts": ["a"], "ref": ["test.t2.a"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["a"], "ref": ["test.t2.a"], "rows": 2, "filtered": 100, "attached_condition": "v2.b < 50", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5 and t1.b < 50" } } } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,v2,t2 where ((v1.a=v2.a) or (v1.a=t2.a)) and (t2.b<50) and (v1.b=v2.b); a b max_c avg_c a b max_c avg_c a b c d 6 20 315 279.3333 6 20 315 279.3333 2 3 207 207 6 20 315 279.3333 6 20 315 279.3333 1 21 909 12 6 20 315 279.3333 6 20 315 279.3333 7 13 312 406 6 20 315 279.3333 6 20 315 279.3333 6 20 315 279 6 20 315 279.3333 6 20 315 279.3333 1 19 203 107 6 20 315 279.3333 6 20 315 279.3333 3 12 231 190 6 20 315 279.3333 6 20 315 279.3333 6 23 303 909 8 33 404 213.6667 8 33 404 213.6667 2 3 207 207 8 33 404 213.6667 8 33 404 213.6667 1 21 909 12 8 33 404 213.6667 8 33 404 213.6667 7 13 312 406 8 33 404 213.6667 8 33 404 213.6667 6 20 315 279 8 33 404 213.6667 8 33 404 213.6667 1 19 203 107 8 33 404 213.6667 8 33 404 213.6667 3 12 231 190 8 33 404 213.6667 8 33 404 213.6667 6 23 303 909 select * from v1,v2,t2 where ((v1.a=v2.a) or (v1.a=t2.a)) and (t2.b<50) and (v1.b=v2.b); a b max_c avg_c a b max_c avg_c a b c d 6 20 315 279.3333 6 20 315 279.3333 2 3 207 207 6 20 315 279.3333 6 20 315 279.3333 1 21 909 12 6 20 315 279.3333 6 20 315 279.3333 7 13 312 406 6 20 315 279.3333 6 20 315 279.3333 6 20 315 279 6 20 315 279.3333 6 20 315 279.3333 1 19 203 107 6 20 315 279.3333 6 20 315 279.3333 3 12 231 190 6 20 315 279.3333 6 20 315 279.3333 6 23 303 909 8 33 404 213.6667 8 33 404 213.6667 2 3 207 207 8 33 404 213.6667 8 33 404 213.6667 1 21 909 12 8 33 404 213.6667 8 33 404 213.6667 7 13 312 406 8 33 404 213.6667 8 33 404 213.6667 6 20 315 279 8 33 404 213.6667 8 33 404 213.6667 1 19 203 107 8 33 404 213.6667 8 33 404 213.6667 3 12 231 190 8 33 404 213.6667 8 33 404 213.6667 6 23 303 909 explain select * from v1,v2,t2 where ((v1.a=v2.a) or (v1.a=t2.a)) and (t2.b<50) and (v1.b=v2.b); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 1 PRIMARY ref key0 key0 5 v1.b 2 Using where 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort explain format=json select * from v1,v2,t2 where ((v1.a=v2.a) or (v1.a=t2.a)) and (t2.b<50) and (v1.b=v2.b); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.b < 50" }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100 }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.b is not null", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["b"], "ref": ["v1.b"], "rows": 2, "filtered": 100, "attached_condition": "v2.a = v1.a or v1.a = t2.a", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5" } } } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,v2,t2 where ((v1.a=v2.a) and (v1.a=t2.a)) or ((v2.b>13) and (t2.c<115)); a b max_c avg_c a b max_c avg_c a b c d 6 20 315 279.3333 6 20 315 279.3333 6 20 315 279 6 20 315 279.3333 6 20 315 279.3333 6 23 303 909 8 33 404 213.6667 8 33 404 213.6667 8 64 248 107 8 33 404 213.6667 8 33 404 213.6667 8 80 800 314 select * from v1,v2,t2 where ((v1.a=v2.a) and (v1.a=t2.a)) or ((v2.b>13) and (t2.c<115)); a b max_c avg_c a b max_c avg_c a b c d 6 20 315 279.3333 6 20 315 279.3333 6 20 315 279 6 20 315 279.3333 6 20 315 279.3333 6 23 303 909 8 33 404 213.6667 8 33 404 213.6667 8 64 248 107 8 33 404 213.6667 8 33 404 213.6667 8 80 800 314 explain select * from v1,v2,t2 where ((v1.a=v2.a) and (v1.a=t2.a)) or ((v2.b>13) and (t2.c<115)); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (incremental, BNL join) 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort explain format=json select * from v1,v2,t2 where ((v1.a=v2.a) and (v1.a=t2.a)) or ((v2.b>13) and (t2.c<115)); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100 }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.a = t2.a or t2.c < 115", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100 }, "buffer_type": "incremental", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.a = t2.a and v2.a = t2.a or v2.b > 13 and t2.c < 115", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5" } } } } } } } } # using several derived tables : pushing in all tables # conjunctive subformula : pushing into HAVING # extracted or formula : pushing into WHERE # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,v2,t2 where ((v1.a=v2.a) or (v1.a=t2.a)) and ((v2.b<50) or (v2.b=19)) and (v1.max_c<300); a b max_c avg_c a b max_c avg_c a b c d 1 19 107 107.0000 6 20 315 279.3333 1 21 909 12 1 19 107 107.0000 6 20 315 279.3333 1 19 203 107 1 19 107 107.0000 8 33 404 213.6667 1 21 909 12 1 19 107 107.0000 8 33 404 213.6667 1 19 203 107 select * from v1,v2,t2 where ((v1.a=v2.a) or (v1.a=t2.a)) and ((v2.b<50) or (v2.b=19)) and (v1.max_c<300); a b max_c avg_c a b max_c avg_c a b c d 1 19 107 107.0000 6 20 315 279.3333 1 21 909 12 1 19 107 107.0000 6 20 315 279.3333 1 19 203 107 1 19 107 107.0000 8 33 404 213.6667 1 21 909 12 1 19 107 107.0000 8 33 404 213.6667 1 19 203 107 explain select * from v1,v2,t2 where ((v1.a=v2.a) or (v1.a=t2.a)) and ((v2.b<50) or (v2.b=19)) and (v1.max_c<300); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (incremental, BNL join) 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort explain format=json select * from v1,v2,t2 where ((v1.a=v2.a) or (v1.a=t2.a)) and ((v2.b<50) or (v2.b=19)) and (v1.max_c<300); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.max_c < 300" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and max_c < 300", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v2.b < 50 or v2.b = 19" }, "buffer_type": "incremental", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "(v2.a = v1.a or v1.a = t2.a) and (v2.b < 50 or v2.b = 19)", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5 and (t1.b < 50 or t1.b = 19)" } } } } } } } } # using several derived tables : pushing only in one table # conjunctive subformula : pushing into WHERE # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,v2,t2 where (v1.a=t2.a) and (v1.a=v1.b) and (v1.a=v2.a) and (v2.max_c<300); a b max_c avg_c a b max_c avg_c a b c d select * from v1,v2,t2 where (v1.a=t2.a) and (v1.a=v1.b) and (v1.a=v2.a) and (v2.max_c<300); a b max_c avg_c a b max_c avg_c a b c d explain select * from v1,v2,t2 where (v1.a=t2.a) and (v1.a=v1.b) and (v1.a=v2.a) and (v2.max_c<300); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key1 key1 10 test.t2.a,test.t2.a 2 1 PRIMARY ref key0 key0 5 test.t2.a 2 Using where 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v1,v2,t2 where (v1.a=t2.a) and (v1.a=v1.b) and (v1.a=v2.a) and (v2.max_c<300); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a is not null and t2.a is not null and t2.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key1"], "key": "key1", "key_length": "10", "used_key_parts": ["a", "b"], "ref": ["test.t2.a", "test.t2.a"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.b = t1.a" } } } } } }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["a"], "ref": ["test.t2.a"], "rows": 2, "filtered": 100, "attached_condition": "v2.max_c < 300", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707 and max_c < 300", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5" } } } } } } } } # using several derived tables : pushing only in one table # extracted and formula : pushing into WHERE # conjunctive subformula : pushing into WHERE using equalities # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,v2,t2 where (v1.a=1) and (v1.b>10) and (v1.b=v2.b); a b max_c avg_c a b max_c avg_c a b c d select * from v1,v2,t2 where (v1.a=1) and (v1.b>10) and (v1.b=v2.b); a b max_c avg_c a b max_c avg_c a b c d explain select * from v1,v2,t2 where (v1.a=1) and (v1.b>10) and (v1.b=v2.b); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 1 PRIMARY ref key0 key0 5 v1.b 2 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v1,v2,t2 where (v1.a=1) and (v1.b>10) and (v1.b=v2.b); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a = 1 and v1.b > 10" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.b is not null", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a = 1 and t1.b > 10" } } } } } }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["b"], "ref": ["v1.b"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5 and t1.b > 10" } } } } } } } } # extracted or formula : pushing into WHERE # conjunctive subformula : pushing into WHERE using equalities # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v_char as v,t2_char as t where (v.a=t.a) and (t.a='b') and ((v.b='Vika') or (v.b='Ali')); a b max_c a b c b Vika 2 b Ivan 1 b Vika 2 b Ali 6 b Vika 2 b Hermes 3 b Vika 2 b Ivan 11 b Vika 2 b Harry 4 select * from v_char as v,t2_char as t where (v.a=t.a) and (t.a='b') and ((v.b='Vika') or (v.b='Ali')); a b max_c a b c b Vika 2 b Ivan 1 b Vika 2 b Ali 6 b Vika 2 b Hermes 3 b Vika 2 b Ivan 11 b Vika 2 b Harry 4 explain select * from v_char as v,t2_char as t where (v.a=t.a) and (t.a='b') and ((v.b='Vika') or (v.b='Ali')); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY ALL NULL NULL NULL NULL 12 Using where 1 PRIMARY t ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1_char ALL NULL NULL NULL NULL 12 Using where; Using temporary; Using filesort explain format=json select * from v_char as v,t2_char as t where (v.a=t.a) and (t.a='b') and ((v.b='Vika') or (v.b='Ali')); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 12, "filtered": 100, "attached_condition": "v.a = 'b' and (v.b = 'Vika' or v.b = 'Ali')", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 9", "filesort": { "sort_key": "t1_char.b", "temporary_table": { "table": { "table_name": "t1_char", "access_type": "ALL", "rows": 12, "filtered": 100, "attached_condition": "t1_char.a = 'b' and (t1_char.b = 'Vika' or t1_char.b = 'Ali')" } } } } } }, "block-nl-join": { "table": { "table_name": "t", "access_type": "ALL", "rows": 12, "filtered": 100, "attached_condition": "t.a = 'b'" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL" } } } # using several derived tables : pushing in all tables # extracted or formula : pushing into WHERE # conjunctive subformulas : pushing into HAVING # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,v2,v3,t2 where ((v1.a=v2.a) or (v1.a=t2.a)) and ((v3.b<50) or (v3.b=33)) and (v1.max_c<500) and (v3.a=t2.a) and (v2.max_c>300); a b max_c avg_c a b max_c avg_c a b min_c a b c d 6 20 315 279.3333 6 20 315 279.3333 7 11 708 7 13 312 406 6 20 315 279.3333 6 20 315 279.3333 8 33 114 8 64 248 107 6 20 315 279.3333 6 20 315 279.3333 6 20 214 6 20 315 279 6 20 315 279.3333 6 20 315 279.3333 8 33 114 8 80 800 314 6 20 315 279.3333 6 20 315 279.3333 6 20 214 6 23 303 909 6 20 315 279.3333 8 33 404 213.6667 6 20 214 6 20 315 279 6 20 315 279.3333 8 33 404 213.6667 6 20 214 6 23 303 909 8 33 404 213.6667 6 20 315 279.3333 8 33 114 8 64 248 107 8 33 404 213.6667 6 20 315 279.3333 8 33 114 8 80 800 314 8 33 404 213.6667 8 33 404 213.6667 7 11 708 7 13 312 406 8 33 404 213.6667 8 33 404 213.6667 8 33 114 8 64 248 107 8 33 404 213.6667 8 33 404 213.6667 6 20 214 6 20 315 279 8 33 404 213.6667 8 33 404 213.6667 8 33 114 8 80 800 314 8 33 404 213.6667 8 33 404 213.6667 6 20 214 6 23 303 909 select * from v1,v2,v3,t2 where ((v1.a=v2.a) or (v1.a=t2.a)) and ((v3.b<50) or (v3.b=33)) and (v1.max_c<500) and (v3.a=t2.a) and (v2.max_c>300); a b max_c avg_c a b max_c avg_c a b min_c a b c d 6 20 315 279.3333 6 20 315 279.3333 7 11 708 7 13 312 406 6 20 315 279.3333 6 20 315 279.3333 8 33 114 8 64 248 107 6 20 315 279.3333 6 20 315 279.3333 6 20 214 6 20 315 279 6 20 315 279.3333 6 20 315 279.3333 8 33 114 8 80 800 314 6 20 315 279.3333 6 20 315 279.3333 6 20 214 6 23 303 909 6 20 315 279.3333 8 33 404 213.6667 6 20 214 6 20 315 279 6 20 315 279.3333 8 33 404 213.6667 6 20 214 6 23 303 909 8 33 404 213.6667 6 20 315 279.3333 8 33 114 8 64 248 107 8 33 404 213.6667 6 20 315 279.3333 8 33 114 8 80 800 314 8 33 404 213.6667 8 33 404 213.6667 7 11 708 7 13 312 406 8 33 404 213.6667 8 33 404 213.6667 8 33 114 8 64 248 107 8 33 404 213.6667 8 33 404 213.6667 6 20 214 6 20 315 279 8 33 404 213.6667 8 33 404 213.6667 8 33 114 8 80 800 314 8 33 404 213.6667 8 33 404 213.6667 6 20 214 6 23 303 909 explain select * from v1,v2,v3,t2 where ((v1.a=v2.a) or (v1.a=t2.a)) and ((v3.b<50) or (v3.b=33)) and (v1.max_c<500) and (v3.a=t2.a) and (v2.max_c>300); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 5 test.t2.a 2 Using where 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (incremental, BNL join) 4 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort explain format=json select * from v1,v2,v3,t2 where ((v1.a=v2.a) or (v1.a=t2.a)) and ((v3.b<50) or (v3.b=33)) and (v1.max_c<500) and (v3.a=t2.a) and (v2.max_c>300); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["a"], "ref": ["test.t2.a"], "rows": 2, "filtered": 100, "attached_condition": "v3.b < 50 or v3.b = 33", "materialized": { "query_block": { "select_id": 4, "having_condition": "min_c > 109", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 10 and (t1.b < 50 or t1.b = 33)" } } } } } }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v2.max_c > 300" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707 and max_c > 300", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5" } } } } } }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.max_c < 500" }, "buffer_type": "incremental", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.a = v2.a or v1.a = t2.a", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and max_c < 500", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } } } } # using several derived tables : pushing in all tables # conjunctive subformulas : pushing into HAVING set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 where t1.a>5 group by a,b having max_c < 707) v1, (select a, b, min(c) as min_c from t1 where t1.a>5 group by a,b having min_c < 707) v2, t2 where (v1.a=v2.a) and (v1.b=t2.b) and (v1.max_c>130) and (v2.min_c<130); a b max_c avg_c a b min_c a b c d select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 where t1.a>5 group by a,b having max_c < 707) v1, (select a, b, min(c) as min_c from t1 where t1.a>5 group by a,b having min_c < 707) v2, t2 where (v1.a=v2.a) and (v1.b=t2.b) and (v1.max_c>130) and (v2.min_c<130); a b max_c avg_c a b min_c a b c d explain select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 where t1.a>5 group by a,b having max_c < 707) v1, (select a, b, min(c) as min_c from t1 where t1.a>5 group by a,b having min_c < 707) v2, t2 where (v1.a=v2.a) and (v1.b=t2.b) and (v1.max_c>130) and (v2.min_c<130); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key1 key1 5 test.t2.b 2 Using where 1 PRIMARY ref key0 key0 5 v1.a 2 Using where 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 where t1.a>5 group by a,b having max_c < 707) v1, (select a, b, min(c) as min_c from t1 where t1.a>5 group by a,b having min_c < 707) v2, t2 where (v1.a=v2.a) and (v1.b=t2.b) and (v1.max_c>130) and (v2.min_c<130); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.b is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key1"], "key": "key1", "key_length": "5", "used_key_parts": ["b"], "ref": ["test.t2.b"], "rows": 2, "filtered": 100, "attached_condition": "v1.max_c > 130 and v1.a is not null", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and max_c > 130", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5" } } } } } }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["a"], "ref": ["v1.a"], "rows": 2, "filtered": 100, "attached_condition": "v2.min_c < 130", "materialized": { "query_block": { "select_id": 3, "having_condition": "min_c < 707 and min_c < 130", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5" } } } } } } } } # using several derived tables : pushing in all tables # extracted or formulas : pushing into HAVING # conjunctive subformula : pushing into HAVING set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 where t1.a>5 group by a,b having max_c < 707) v1, (select a, b, min(c) as min_c from t1 where t1.a>5 group by a,b having min_c < 707) v2, (select a, b, avg(c) as avg_c from t1 where t1.a<8 group by a,b) v3, t2 where (v1.a=v2.a) and (v1.b=v3.b) and ((v3.avg_c>170) or (v3.a<5)) and ((v1.avg_c<400) or (v1.a>1)) and (v2.min_c<200); a b max_c avg_c a b min_c a b avg_c a b c d 8 33 404 213.6667 8 33 114 1 33 497.5000 2 3 207 207 8 33 404 213.6667 8 33 114 1 33 497.5000 1 21 909 12 8 33 404 213.6667 8 33 114 1 33 497.5000 7 13 312 406 8 33 404 213.6667 8 33 114 1 33 497.5000 8 64 248 107 8 33 404 213.6667 8 33 114 1 33 497.5000 6 20 315 279 8 33 404 213.6667 8 33 114 1 33 497.5000 1 19 203 107 8 33 404 213.6667 8 33 114 1 33 497.5000 8 80 800 314 8 33 404 213.6667 8 33 114 1 33 497.5000 3 12 231 190 8 33 404 213.6667 8 33 114 1 33 497.5000 6 23 303 909 select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 where t1.a>5 group by a,b having max_c < 707) v1, (select a, b, min(c) as min_c from t1 where t1.a>5 group by a,b having min_c < 707) v2, (select a, b, avg(c) as avg_c from t1 where t1.a<8 group by a,b) v3, t2 where (v1.a=v2.a) and (v1.b=v3.b) and ((v3.avg_c>170) or (v3.a<5)) and ((v1.avg_c<400) or (v1.a>1)) and (v2.min_c<200); a b max_c avg_c a b min_c a b avg_c a b c d 8 33 404 213.6667 8 33 114 1 33 497.5000 2 3 207 207 8 33 404 213.6667 8 33 114 1 33 497.5000 1 21 909 12 8 33 404 213.6667 8 33 114 1 33 497.5000 7 13 312 406 8 33 404 213.6667 8 33 114 1 33 497.5000 8 64 248 107 8 33 404 213.6667 8 33 114 1 33 497.5000 6 20 315 279 8 33 404 213.6667 8 33 114 1 33 497.5000 1 19 203 107 8 33 404 213.6667 8 33 114 1 33 497.5000 8 80 800 314 8 33 404 213.6667 8 33 114 1 33 497.5000 3 12 231 190 8 33 404 213.6667 8 33 114 1 33 497.5000 6 23 303 909 explain select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 where t1.a>5 group by a,b having max_c < 707) v1, (select a, b, min(c) as min_c from t1 where t1.a>5 group by a,b having min_c < 707) v2, (select a, b, avg(c) as avg_c from t1 where t1.a<8 group by a,b) v3, t2 where (v1.a=v2.a) and (v1.b=v3.b) and ((v3.avg_c>170) or (v3.a<5)) and ((v1.avg_c<400) or (v1.a>1)) and (v2.min_c<200); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 1 PRIMARY ref key0 key0 5 v1.a 2 Using where 1 PRIMARY ref key0 key0 5 v1.b 2 Using where 4 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 where t1.a>5 group by a,b having max_c < 707) v1, (select a, b, min(c) as min_c from t1 where t1.a>5 group by a,b having min_c < 707) v2, (select a, b, avg(c) as avg_c from t1 where t1.a<8 group by a,b) v3, t2 where (v1.a=v2.a) and (v1.b=v3.b) and ((v3.avg_c>170) or (v3.a<5)) and ((v1.avg_c<400) or (v1.a>1)) and (v2.min_c<200); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.avg_c < 400 or v1.a > 1" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "(v1.avg_c < 400 or v1.a > 1) and v1.a is not null and v1.b is not null", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and (avg_c < 400 or t1.a > 1)", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5" } } } } } }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["a"], "ref": ["v1.a"], "rows": 2, "filtered": 100, "attached_condition": "v2.min_c < 200", "materialized": { "query_block": { "select_id": 3, "having_condition": "min_c < 707 and min_c < 200", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5" } } } } } }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["b"], "ref": ["v1.b"], "rows": 2, "filtered": 100, "attached_condition": "v3.avg_c > 170 or v3.a < 5", "materialized": { "query_block": { "select_id": 4, "having_condition": "avg_c > 170 or t1.a < 5", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 8" } } } } } } } } # extracted or formula : pushing into HAVING # conjunctive subformula : pushing into WHERE set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 group by a,b having max_c < 707) v1, t2 where ((v1.a=1) or (v1.max_c<300)) and (v1.b>25); a b max_c avg_c a b c d 5 27 132 132.0000 2 3 207 207 5 27 132 132.0000 1 21 909 12 5 27 132 132.0000 7 13 312 406 5 27 132 132.0000 8 64 248 107 5 27 132 132.0000 6 20 315 279 5 27 132 132.0000 1 19 203 107 5 27 132 132.0000 8 80 800 314 5 27 132 132.0000 3 12 231 190 5 27 132 132.0000 6 23 303 909 select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 group by a,b having max_c < 707) v1, t2 where ((v1.a=1) or (v1.max_c<300)) and (v1.b>25); a b max_c avg_c a b c d 5 27 132 132.0000 2 3 207 207 5 27 132 132.0000 1 21 909 12 5 27 132 132.0000 7 13 312 406 5 27 132 132.0000 8 64 248 107 5 27 132 132.0000 6 20 315 279 5 27 132 132.0000 1 19 203 107 5 27 132 132.0000 8 80 800 314 5 27 132 132.0000 3 12 231 190 5 27 132 132.0000 6 23 303 909 explain select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 group by a,b having max_c < 707) v1, t2 where ((v1.a=1) or (v1.max_c<300)) and (v1.b>25); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 group by a,b having max_c < 707) v1, t2 where ((v1.a=1) or (v1.max_c<300)) and (v1.b>25); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "(v1.a = 1 or v1.max_c < 300) and v1.b > 25" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.a = 1 or v1.max_c < 300", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and (t1.a = 1 or max_c < 300)", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.b > 25" } } } } } } } } # extracted and formula : pushing into WHERE # conjunctive subformula : pushing into HAVING set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 where t1.a>5 group by a,b having max_c < 707) v1, t2 where (v1.a=t2.a) and (v1.max_c>300) and (v1.b<30); a b max_c avg_c a b c d 6 20 315 279.3333 6 20 315 279 6 20 315 279.3333 6 23 303 909 select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 where t1.a>5 group by a,b having max_c < 707) v1, t2 where (v1.a=t2.a) and (v1.max_c>300) and (v1.b<30); a b max_c avg_c a b c d 6 20 315 279.3333 6 20 315 279 6 20 315 279.3333 6 23 303 909 explain select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 where t1.a>5 group by a,b having max_c < 707) v1, t2 where (v1.a=t2.a) and (v1.max_c>300) and (v1.b<30); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 5 test.t2.a 2 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from (select a, b, max(c) as max_c, avg(c) as avg_c from t1 where t1.a>5 group by a,b having max_c < 707) v1, t2 where (v1.a=t2.a) and (v1.max_c>300) and (v1.b<30); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["a"], "ref": ["test.t2.a"], "rows": 2, "filtered": 100, "attached_condition": "v1.max_c > 300 and v1.b < 30", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 707 and max_c > 300", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5 and t1.b < 30" } } } } } } } } # using query with union # conjunctive subformula : pushing into WHERE # conjunctive subformulas : pushing into HAVING and WHERE set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where (v1.a<5) and (v1.b=t2.b) and (t2.c>800) union select * from v1,t2 where (v1.max_c>100) and (v1.a>7) and (t2.d>800); a b max_c avg_c a b c d 1 21 500 234.6000 1 21 909 12 8 33 404 213.6667 6 23 303 909 select * from v1,t2 where (v1.a<5) and (v1.b=t2.b) and (t2.c>800) union select * from v1,t2 where (v1.max_c>100) and (v1.a>7) and (t2.d>800); a b max_c avg_c a b c d 1 21 500 234.6000 1 21 909 12 8 33 404 213.6667 6 23 303 909 explain select * from v1,t2 where (v1.a<5) and (v1.b=t2.b) and (t2.c>800) union select * from v1,t2 where (v1.max_c>100) and (v1.a>7) and (t2.d>800); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 5 test.t2.b 2 Using where 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 UNION t2 ALL NULL NULL NULL NULL 9 Using where 2 UNION ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 4 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort NULL UNION RESULT ALL NULL NULL NULL NULL NULL explain format=json select * from v1,t2 where (v1.a<5) and (v1.b=t2.b) and (t2.c>800) union select * from v1,t2 where (v1.max_c>100) and (v1.a>7) and (t2.d>800); EXPLAIN { "query_block": { "union_result": { "table_name": "", "access_type": "ALL", "query_specifications": [ { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.c > 800 and t2.b is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["b"], "ref": ["test.t2.b"], "rows": 2, "filtered": 100, "attached_condition": "v1.a < 5", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 5" } } } } } } } }, { "query_block": { "select_id": 2, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.d > 800" }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.max_c > 100 and v1.a > 7" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "materialized": { "query_block": { "select_id": 4, "having_condition": "max_c < 707 and max_c > 100", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 7" } } } } } } } } ] } } } # using query with union # extracted and formula : pushing into WHERE # extracted or formula : pushing into HAVING # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where (v1.a<5) and (v1.b=t2.b) and (v1.b=19) union select * from v1,t2 where ((v1.max_c>400) or (v1.avg_c>270)) and (v1.a400) or (v1.avg_c>270)) and (v1.a400) or (v1.avg_c>270)) and (v1.a ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 UNION t2 ALL NULL NULL NULL NULL 9 2 UNION ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 4 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort NULL UNION RESULT ALL NULL NULL NULL NULL NULL explain format=json select * from v1,t2 where (v1.a<5) and (v1.b=t2.b) and (v1.b=19) union select * from v1,t2 where ((v1.max_c>400) or (v1.avg_c>270)) and (v1.a", "access_type": "ALL", "query_specifications": [ { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.b = 19" }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.b = 19 and v1.a < 5" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.b = 19 and t1.a < 5" } } } } } } } }, { "query_block": { "select_id": 2, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.max_c > 400 or v1.avg_c > 270" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "(v1.max_c > 400 or v1.avg_c > 270) and v1.a < t2.a", "materialized": { "query_block": { "select_id": 4, "having_condition": "max_c < 707 and (max_c > 400 or avg_c > 270)", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } } } } ] } } } # using query with union # extracted or formula : pushing into HAVING # extracted or formula : pushing into WHERE # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where ((t2.a=v1.a) or (v1.b=t2.b)) and ((v1.a=1) or (v1.a=6)) union select * from v1,t2 where ((v1.a>3) and (v1.b>27)) or (v1.max_c>550); a b max_c avg_c a b c d 1 19 107 107.0000 1 21 909 12 1 19 107 107.0000 1 19 203 107 1 21 500 234.6000 1 21 909 12 1 21 500 234.6000 1 19 203 107 6 20 315 279.3333 6 20 315 279 6 20 315 279.3333 6 23 303 909 8 33 404 213.6667 2 3 207 207 8 33 404 213.6667 1 21 909 12 8 33 404 213.6667 7 13 312 406 8 33 404 213.6667 8 64 248 107 8 33 404 213.6667 6 20 315 279 8 33 404 213.6667 1 19 203 107 8 33 404 213.6667 8 80 800 314 8 33 404 213.6667 3 12 231 190 8 33 404 213.6667 6 23 303 909 select * from v1,t2 where ((t2.a=v1.a) or (v1.b=t2.b)) and ((v1.a=1) or (v1.a=6)) union select * from v1,t2 where ((v1.a>3) and (v1.b>27)) or (v1.max_c>550); a b max_c avg_c a b c d 1 19 107 107.0000 1 21 909 12 1 19 107 107.0000 1 19 203 107 1 21 500 234.6000 1 21 909 12 1 21 500 234.6000 1 19 203 107 6 20 315 279.3333 6 20 315 279 6 20 315 279.3333 6 23 303 909 8 33 404 213.6667 2 3 207 207 8 33 404 213.6667 1 21 909 12 8 33 404 213.6667 7 13 312 406 8 33 404 213.6667 8 64 248 107 8 33 404 213.6667 6 20 315 279 8 33 404 213.6667 1 19 203 107 8 33 404 213.6667 8 80 800 314 8 33 404 213.6667 3 12 231 190 8 33 404 213.6667 6 23 303 909 explain select * from v1,t2 where ((t2.a=v1.a) or (v1.b=t2.b)) and ((v1.a=1) or (v1.a=6)) union select * from v1,t2 where ((v1.a>3) and (v1.b>27)) or (v1.max_c>550); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 UNION t2 ALL NULL NULL NULL NULL 9 2 UNION ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 4 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort NULL UNION RESULT ALL NULL NULL NULL NULL NULL explain format=json select * from v1,t2 where ((t2.a=v1.a) or (v1.b=t2.b)) and ((v1.a=1) or (v1.a=6)) union select * from v1,t2 where ((v1.a>3) and (v1.b>27)) or (v1.max_c>550); EXPLAIN { "query_block": { "union_result": { "table_name": "", "access_type": "ALL", "query_specifications": [ { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a = 1 or v1.a = 6" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "(v1.a = t2.a or v1.b = t2.b) and (v1.a = 1 or v1.a = 6)", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a = 1 or t1.a = 6" } } } } } } } }, { "query_block": { "select_id": 2, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a > 3 and v1.b > 27 or v1.max_c > 550" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.a > 3 and v1.b > 27 or v1.max_c > 550", "materialized": { "query_block": { "select_id": 4, "having_condition": "max_c < 707 and (t1.a > 3 and t1.b > 27 or max_c > 550)", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } } } } ] } } } # using query with union # extracted or formula : pushing into HAVING # conjunctive subformulas : pushing into WHERE # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v1,t2 where ((v1.a=1) and (v1.a=t2.a)) and ((v1.max_c<500) or (v1.avg_c>500)) union select * from v2,t2 where ((v2.a200)) and (v2.b>10) and (t2.a<2) union select * from v2,t2 where (v2.max_c=t2.c) and (v2.b<10); a b max_c avg_c a b c d 1 19 107 107.0000 1 21 909 12 1 19 107 107.0000 1 19 203 107 6 20 315 279.3333 1 21 909 12 6 20 315 279.3333 1 19 203 107 8 33 404 213.6667 1 21 909 12 8 33 404 213.6667 1 19 203 107 select * from v1,t2 where ((v1.a=1) and (v1.a=t2.a)) and ((v1.max_c<500) or (v1.avg_c>500)) union select * from v2,t2 where ((v2.a200)) and (v2.b>10) and (t2.a<2) union select * from v2,t2 where (v2.max_c=t2.c) and (v2.b<10); a b max_c avg_c a b c d 1 19 107 107.0000 1 21 909 12 1 19 107 107.0000 1 19 203 107 6 20 315 279.3333 1 21 909 12 6 20 315 279.3333 1 19 203 107 8 33 404 213.6667 1 21 909 12 8 33 404 213.6667 1 19 203 107 explain select * from v1,t2 where ((v1.a=1) and (v1.a=t2.a)) and ((v1.max_c<500) or (v1.avg_c>500)) union select * from v2,t2 where ((v2.a200)) and (v2.b>10) and (t2.a<2) union select * from v2,t2 where (v2.max_c=t2.c) and (v2.b<10); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 4 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 UNION t2 ALL NULL NULL NULL NULL 9 Using where 2 UNION ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 5 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 UNION t2 ALL NULL NULL NULL NULL 9 Using where 3 UNION ref key0 key0 5 test.t2.c 2 Using where 6 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort NULL UNION RESULT ALL NULL NULL NULL NULL NULL explain format=json select * from v1,t2 where ((v1.a=1) and (v1.a=t2.a)) and ((v1.max_c<500) or (v1.avg_c>500)) union select * from v2,t2 where ((v2.a200)) and (v2.b>10) and (t2.a<2) union select * from v2,t2 where (v2.max_c=t2.c) and (v2.b<10); EXPLAIN { "query_block": { "union_result": { "table_name": "", "access_type": "ALL", "query_specifications": [ { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a = 1" }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a = 1 and (v1.max_c < 500 or v1.avg_c > 500)" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v1.max_c < 500 or v1.avg_c > 500", "materialized": { "query_block": { "select_id": 4, "having_condition": "max_c < 707 and (max_c < 500 or avg_c > 500)", "filesort": { "sort_key": "t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a = 1" } } } } } } } }, { "query_block": { "select_id": 2, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a < 2" }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v2.b > 10" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v2.a < t2.b or v2.max_c > 200", "materialized": { "query_block": { "select_id": 5, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5 and t1.b > 10" } } } } } } } }, { "query_block": { "select_id": 3, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.c is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["max_c"], "ref": ["test.t2.c"], "rows": 2, "filtered": 100, "attached_condition": "v2.b < 10", "materialized": { "query_block": { "select_id": 6, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5 and t1.b < 10" } } } } } } } } ] } } } # using derived table with union # conjunctive subformulas : pushing into WHERE and HAVING set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v_union,t2 where (v_union.a<3) and (v_union.c>100); a b c a b c d 1 19 107 2 3 207 207 1 19 107 1 21 909 12 1 19 107 7 13 312 406 1 19 107 8 64 248 107 1 19 107 6 20 315 279 1 19 107 1 19 203 107 1 19 107 8 80 800 314 1 19 107 3 12 231 190 1 19 107 6 23 303 909 select * from v_union,t2 where (v_union.a<3) and (v_union.c>100); a b c a b c d 1 19 107 2 3 207 207 1 19 107 1 21 909 12 1 19 107 7 13 312 406 1 19 107 8 64 248 107 1 19 107 6 20 315 279 1 19 107 1 19 203 107 1 19 107 8 80 800 314 1 19 107 3 12 231 190 1 19 107 6 23 303 909 explain select * from v_union,t2 where (v_union.a<3) and (v_union.c>100); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 1 PRIMARY ALL NULL NULL NULL NULL 40 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 UNION t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort NULL UNION RESULT ALL NULL NULL NULL NULL NULL explain format=json select * from v_union,t2 where (v_union.a<3) and (v_union.c>100); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 40, "filtered": 100, "attached_condition": "v_union.a < 3 and v_union.c > 100" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "materialized": { "query_block": { "union_result": { "table_name": "", "access_type": "ALL", "query_specifications": [ { "query_block": { "select_id": 2, "having_condition": "c > 109 and c > 100", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 10 and t1.a < 3" } } } } }, { "query_block": { "select_id": 3, "having_condition": "c < 300 and c > 100", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.b > 10 and t1.a < 3" } } } } } ] } } } } } } # using derived table with union # conjunctive subformula : pushing into WHERE # extracted or formula : pushing into HAVING set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v_union,t2 where ((v_union.a<2) or (v_union.c>800)) and (v_union.b>12); a b c a b c d 1 19 107 2 3 207 207 1 19 107 1 21 909 12 1 19 107 7 13 312 406 1 19 107 8 64 248 107 1 19 107 6 20 315 279 1 19 107 1 19 203 107 1 19 107 8 80 800 314 1 19 107 3 12 231 190 1 19 107 6 23 303 909 select * from v_union,t2 where ((v_union.a<2) or (v_union.c>800)) and (v_union.b>12); a b c a b c d 1 19 107 2 3 207 207 1 19 107 1 21 909 12 1 19 107 7 13 312 406 1 19 107 8 64 248 107 1 19 107 6 20 315 279 1 19 107 1 19 203 107 1 19 107 8 80 800 314 1 19 107 3 12 231 190 1 19 107 6 23 303 909 explain select * from v_union,t2 where ((v_union.a<2) or (v_union.c>800)) and (v_union.b>12); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 1 PRIMARY ALL NULL NULL NULL NULL 40 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 UNION t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort NULL UNION RESULT ALL NULL NULL NULL NULL NULL explain format=json select * from v_union,t2 where ((v_union.a<2) or (v_union.c>800)) and (v_union.b>12); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 40, "filtered": 100, "attached_condition": "(v_union.a < 2 or v_union.c > 800) and v_union.b > 12" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v_union.a < 2 or v_union.c > 800", "materialized": { "query_block": { "union_result": { "table_name": "", "access_type": "ALL", "query_specifications": [ { "query_block": { "select_id": 2, "having_condition": "c > 109 and (t1.a < 2 or c > 800)", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 10 and t1.b > 12" } } } } }, { "query_block": { "select_id": 3, "having_condition": "c < 300 and (t1.a < 2 or c > 800)", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.b > 10 and t1.b > 12" } } } } } ] } } } } } } # using derived table with union # conjunctive subformula : pushing into HAVING # conjunctive subformula : pushing into WHERE # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v_union,t2 where (v_union.a=1) and (v_union.a=t2.a) and (v_union.c<200); a b c a b c d 1 19 107 1 21 909 12 1 19 107 1 19 203 107 select * from v_union,t2 where (v_union.a=1) and (v_union.a=t2.a) and (v_union.c<200); a b c a b c d 1 19 107 1 21 909 12 1 19 107 1 19 203 107 explain select * from v_union,t2 where (v_union.a=1) and (v_union.a=t2.a) and (v_union.c<200); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ALL NULL NULL NULL NULL 40 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 UNION t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort NULL UNION RESULT ALL NULL NULL NULL NULL NULL explain format=json select * from v_union,t2 where (v_union.a=1) and (v_union.a=t2.a) and (v_union.c<200); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a = 1" }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 40, "filtered": 100, "attached_condition": "v_union.a = 1 and v_union.c < 200" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "materialized": { "query_block": { "union_result": { "table_name": "", "access_type": "ALL", "query_specifications": [ { "query_block": { "select_id": 2, "having_condition": "c > 109 and c < 200", "filesort": { "sort_key": "t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a = 1" } } } } }, { "query_block": { "select_id": 3, "having_condition": "c < 300 and c < 200", "filesort": { "sort_key": "t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a = 1 and t1.b > 10" } } } } } ] } } } } } } set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v_char as v,t2_char as t where (v.a=t.a) and (v.b='Vika') and (v.max_c>2); a b max_c a b c c Vika 7 c Vinny 3 c Vika 7 c Inga 9 c Vika 7 c Ivan 2 c Vika 7 c Inga 2 select * from v_char as v,t2_char as t where (v.a=t.a) and (v.b='Vika') and (v.max_c>2); a b max_c a b c c Vika 7 c Vinny 3 c Vika 7 c Inga 9 c Vika 7 c Ivan 2 c Vika 7 c Inga 2 explain select * from v_char as v,t2_char as t where (v.a=t.a) and (v.b='Vika') and (v.max_c>2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t ALL NULL NULL NULL NULL 12 Using where 1 PRIMARY ref key0 key0 2 test.t.a 2 Using where 2 DERIVED t1_char ALL NULL NULL NULL NULL 12 Using where; Using temporary; Using filesort explain format=json select * from v_char as v,t2_char as t where (v.a=t.a) and (v.b='Vika') and (v.max_c>2); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t", "access_type": "ALL", "rows": 12, "filtered": 100, "attached_condition": "t.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "2", "used_key_parts": ["a"], "ref": ["test.t.a"], "rows": 2, "filtered": 100, "attached_condition": "v.b = 'Vika' and v.max_c > 2", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c < 9 and max_c > 2", "filesort": { "sort_key": "t1_char.a", "temporary_table": { "table": { "table_name": "t1_char", "access_type": "ALL", "rows": 12, "filtered": 100, "attached_condition": "t1_char.b = 'Vika'" } } } } } } } } # using derived table with union # using several derived tables : pushing in all tables # conjunctive subformula : pushing into WHERE using equalities # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v_union,v1,t2 where (v_union.a=v1.a) and (v1.a=t2.a) and (t2.a=1) and ((v_union.c>800) or (v1.max_c>200)); a b c a b max_c avg_c a b c d 1 19 107 1 21 500 234.6000 1 21 909 12 1 19 107 1 21 500 234.6000 1 19 203 107 select * from v_union,v1,t2 where (v_union.a=v1.a) and (v1.a=t2.a) and (t2.a=1) and ((v_union.c>800) or (v1.max_c>200)); a b c a b max_c avg_c a b c d 1 19 107 1 21 500 234.6000 1 21 909 12 1 19 107 1 21 500 234.6000 1 19 203 107 explain select * from v_union,v1,t2 where (v_union.a=v1.a) and (v1.a=t2.a) and (t2.a=1) and ((v_union.c>800) or (v1.max_c>200)); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 1 PRIMARY ALL NULL NULL NULL NULL 40 Using where; Using join buffer (incremental, BNL join) 4 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 UNION t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort NULL UNION RESULT ALL NULL NULL NULL NULL NULL explain format=json select * from v_union,v1,t2 where (v_union.a=v1.a) and (v1.a=t2.a) and (t2.a=1) and ((v_union.c>800) or (v1.max_c>200)); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a = 1" }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a = 1" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "materialized": { "query_block": { "select_id": 4, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a = 1" } } } } } }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 40, "filtered": 100, "attached_condition": "v_union.a = 1" }, "buffer_type": "incremental", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "v_union.c > 800 or v1.max_c > 200", "materialized": { "query_block": { "union_result": { "table_name": "", "access_type": "ALL", "query_specifications": [ { "query_block": { "select_id": 2, "having_condition": "c > 109", "filesort": { "sort_key": "t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a = 1" } } } } }, { "query_block": { "select_id": 3, "having_condition": "c < 300", "filesort": { "sort_key": "t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a = 1 and t1.b > 10" } } } } } ] } } } } } } # using derived table with union # extracted or formula : pushing into WHERE # conjunctive subformula : pushing into HAVING # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v2_union as v,t2 where ((v.a=6) or (v.a=8)) and (v.c>200) and (v.a=t2.a); a b c a b c d 8 33 404.0000 8 64 248 107 6 20 312.0000 6 20 315 279 6 20 214.0000 6 20 315 279 8 33 404.0000 8 80 800 314 6 20 312.0000 6 23 303 909 6 20 214.0000 6 23 303 909 select * from v2_union as v,t2 where ((v.a=6) or (v.a=8)) and (v.c>200) and (v.a=t2.a); a b c a b c d 8 33 404.0000 8 64 248 107 6 20 312.0000 6 20 315 279 6 20 214.0000 6 20 315 279 8 33 404.0000 8 80 800 314 6 20 312.0000 6 23 303 909 6 20 214.0000 6 23 303 909 explain select * from v2_union as v,t2 where ((v.a=6) or (v.a=8)) and (v.c>200) and (v.a=t2.a); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 5 test.t2.a 6 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 UNION t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 4 UNION t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort NULL UNION RESULT ALL NULL NULL NULL NULL NULL explain format=json select * from v2_union as v,t2 where ((v.a=6) or (v.a=8)) and (v.c>200) and (v.a=t2.a); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "(t2.a = 6 or t2.a = 8) and t2.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["a"], "ref": ["test.t2.a"], "rows": 6, "filtered": 100, "attached_condition": "v.c > 200", "materialized": { "query_block": { "union_result": { "table_name": "", "access_type": "ALL", "query_specifications": [ { "query_block": { "select_id": 2, "having_condition": "c > 109 and c > 200", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 10 and (t1.a = 6 or t1.a = 8)" } } } } }, { "query_block": { "select_id": 3, "having_condition": "c < 300 and c > 200", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.b > 10 and (t1.a = 6 or t1.a = 8)" } } } } }, { "query_block": { "select_id": 4, "having_condition": "c < 707 and c > 200", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.c > 300 and (t1.a = 6 or t1.a = 8)" } } } } } ] } } } } } } # using derived table with union of selects without aggregation # extracted conjunctive predicate: pushing in WHERE of both selects set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v3_union as v,t2 where (v.a=t2.a) and (v.c>6); a b c a b c d 1 21 123 1 21 909 12 1 21 101 1 21 909 12 1 21 104 1 21 909 12 1 33 988 1 21 909 12 1 19 107 1 21 909 12 1 21 500 1 21 909 12 1 21 345 1 21 909 12 7 11 708 7 13 312 406 7 11 8 7 13 312 406 8 33 404 8 64 248 107 8 33 123 8 64 248 107 8 33 114 8 64 248 107 8 33 9 8 64 248 107 6 20 214 6 20 315 279 6 20 315 6 20 315 279 6 20 309 6 20 315 279 6 20 7 6 20 315 279 1 21 123 1 19 203 107 1 21 101 1 19 203 107 1 21 104 1 19 203 107 1 33 988 1 19 203 107 1 19 107 1 19 203 107 1 21 500 1 19 203 107 1 21 345 1 19 203 107 8 33 404 8 80 800 314 8 33 123 8 80 800 314 8 33 114 8 80 800 314 8 33 9 8 80 800 314 6 20 214 6 23 303 909 6 20 315 6 23 303 909 6 20 309 6 23 303 909 6 20 7 6 23 303 909 select * from v3_union as v,t2 where (v.a=t2.a) and (v.c>6); a b c a b c d 1 21 123 1 21 909 12 1 21 101 1 21 909 12 1 21 104 1 21 909 12 1 33 988 1 21 909 12 1 19 107 1 21 909 12 1 21 500 1 21 909 12 1 21 345 1 21 909 12 7 11 708 7 13 312 406 7 11 8 7 13 312 406 8 33 404 8 64 248 107 8 33 123 8 64 248 107 8 33 114 8 64 248 107 8 33 9 8 64 248 107 6 20 214 6 20 315 279 6 20 315 6 20 315 279 6 20 309 6 20 315 279 6 20 7 6 20 315 279 1 21 123 1 19 203 107 1 21 101 1 19 203 107 1 21 104 1 19 203 107 1 33 988 1 19 203 107 1 19 107 1 19 203 107 1 21 500 1 19 203 107 1 21 345 1 19 203 107 8 33 404 8 80 800 314 8 33 123 8 80 800 314 8 33 114 8 80 800 314 8 33 9 8 80 800 314 6 20 214 6 23 303 909 6 20 315 6 23 303 909 6 20 309 6 23 303 909 6 20 7 6 23 303 909 explain select * from v3_union as v,t2 where (v.a=t2.a) and (v.c>6); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 5 test.t2.a 4 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where 3 UNION t1 ALL NULL NULL NULL NULL 20 Using where NULL UNION RESULT ALL NULL NULL NULL NULL NULL explain format=json select * from v3_union as v,t2 where (v.a=t2.a) and (v.c>6); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["a"], "ref": ["test.t2.a"], "rows": 4, "filtered": 100, "attached_condition": "v.c > 6", "materialized": { "query_block": { "union_result": { "table_name": "", "access_type": "ALL", "query_specifications": [ { "query_block": { "select_id": 2, "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 10 and t1.a + 1 > 6" } } }, { "query_block": { "select_id": 3, "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.b > 10 and t1.c > 100 and t1.c > 6" } } } ] } } } } } } # using derived table with union of selects without aggregation # extracted conjunctive OR subformula: pushing in WHERE using equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v3_union as v,t2 where (v.a=t2.a) and ((t2.a>1) or (v.b<20)); a b c a b c d 1 19 107 1 21 909 12 1 19 2 1 21 909 12 7 11 708 7 13 312 406 7 11 8 7 13 312 406 8 33 404 8 64 248 107 8 33 123 8 64 248 107 8 33 114 8 64 248 107 8 33 9 8 64 248 107 6 20 214 6 20 315 279 6 20 315 6 20 315 279 6 20 309 6 20 315 279 6 20 7 6 20 315 279 1 19 107 1 19 203 107 1 19 2 1 19 203 107 8 33 404 8 80 800 314 8 33 123 8 80 800 314 8 33 114 8 80 800 314 8 33 9 8 80 800 314 6 20 214 6 23 303 909 6 20 315 6 23 303 909 6 20 309 6 23 303 909 6 20 7 6 23 303 909 select * from v3_union as v,t2 where (v.a=t2.a) and ((t2.a>1) or (v.b<20)); a b c a b c d 1 19 107 1 21 909 12 1 19 2 1 21 909 12 7 11 708 7 13 312 406 7 11 8 7 13 312 406 8 33 404 8 64 248 107 8 33 123 8 64 248 107 8 33 114 8 64 248 107 8 33 9 8 64 248 107 6 20 214 6 20 315 279 6 20 315 6 20 315 279 6 20 309 6 20 315 279 6 20 7 6 20 315 279 1 19 107 1 19 203 107 1 19 2 1 19 203 107 8 33 404 8 80 800 314 8 33 123 8 80 800 314 8 33 114 8 80 800 314 8 33 9 8 80 800 314 6 20 214 6 23 303 909 6 20 315 6 23 303 909 6 20 309 6 23 303 909 6 20 7 6 23 303 909 explain select * from v3_union as v,t2 where (v.a=t2.a) and ((t2.a>1) or (v.b<20)); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 5 test.t2.a 4 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where 3 UNION t1 ALL NULL NULL NULL NULL 20 Using where NULL UNION RESULT ALL NULL NULL NULL NULL NULL explain format=json select * from v3_union as v,t2 where (v.a=t2.a) and ((t2.a>1) or (v.b<20)); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["a"], "ref": ["test.t2.a"], "rows": 4, "filtered": 100, "attached_condition": "t2.a > 1 or v.b < 20", "materialized": { "query_block": { "union_result": { "table_name": "", "access_type": "ALL", "query_specifications": [ { "query_block": { "select_id": 2, "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 10 and (t1.a > 1 or t1.b < 20)" } } }, { "query_block": { "select_id": 3, "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.b > 10 and t1.c > 100 and (t1.a > 1 or t1.b < 20)" } } } ] } } } } } } # using derived table with union of selects without aggregation # extracted the whole condition: in WHERE of both selects set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v3_union as v,t2 where (v.a=t2.a) and ((v.b=19) or (v.b=21)) and ((v.c<3) or (v.c>600)); a b c a b c d 1 19 2 1 21 909 12 1 21 2 1 21 909 12 1 19 2 1 19 203 107 1 21 2 1 19 203 107 select * from v3_union as v,t2 where (v.a=t2.a) and ((v.b=19) or (v.b=21)) and ((v.c<3) or (v.c>600)); a b c a b c d 1 19 2 1 21 909 12 1 21 2 1 21 909 12 1 19 2 1 19 203 107 1 21 2 1 19 203 107 explain select * from v3_union as v,t2 where (v.a=t2.a) and ((v.b=19) or (v.b=21)) and ((v.c<3) or (v.c>600)); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 5 test.t2.a 4 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where 3 UNION t1 ALL NULL NULL NULL NULL 20 Using where NULL UNION RESULT ALL NULL NULL NULL NULL NULL explain format=json select * from v3_union as v,t2 where (v.a=t2.a) and ((v.b=19) or (v.b=21)) and ((v.c<3) or (v.c>600)); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["a"], "ref": ["test.t2.a"], "rows": 4, "filtered": 100, "attached_condition": "(v.b = 19 or v.b = 21) and (v.c < 3 or v.c > 600)", "materialized": { "query_block": { "union_result": { "table_name": "", "access_type": "ALL", "query_specifications": [ { "query_block": { "select_id": 2, "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 10 and (t1.b = 19 or t1.b = 21) and (t1.a + 1 < 3 or t1.a + 1 > 600)" } } }, { "query_block": { "select_id": 3, "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.b > 10 and t1.c > 100 and (t1.b = 19 or t1.b = 21) and (t1.c < 3 or t1.c > 600)" } } } ] } } } } } } # using derived table with union of # a select without aggregation and a select with aggregation # extracted conjunctive predicate: pushing in WHERE of both selects set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v4_union as v,t2 where (v.a=t2.a) and (v.b<20); a b c a b c d 1 19 207 1 21 909 12 7 11 808 7 13 312 406 7 11 608 7 13 312 406 1 19 207 1 19 203 107 select * from v4_union as v,t2 where (v.a=t2.a) and (v.b<20); a b c a b c d 1 19 207 1 21 909 12 7 11 808 7 13 312 406 7 11 608 7 13 312 406 1 19 207 1 19 203 107 explain select * from v4_union as v,t2 where (v.a=t2.a) and (v.b<20); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 5 test.t2.a 4 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 UNION t1 ALL NULL NULL NULL NULL 20 Using where NULL UNION RESULT ALL NULL NULL NULL NULL NULL explain format=json select * from v4_union as v,t2 where (v.a=t2.a) and (v.b<20); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["a"], "ref": ["test.t2.a"], "rows": 4, "filtered": 100, "attached_condition": "v.b < 20", "materialized": { "query_block": { "union_result": { "table_name": "", "access_type": "ALL", "query_specifications": [ { "query_block": { "select_id": 2, "having_condition": "c > 109", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 10 and t1.b < 20" } } } } }, { "query_block": { "select_id": 3, "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.b > 10 and t1.b < 20" } } } ] } } } } } } # using derived table with union of # a select without aggregation and a select with aggregation # extracted subformula: pushing in WHERE of one select # extracted subformula: pushing in HAVING of the other select # extracted sub-subformula: pushing in WHERE of the other select # using an equality in all pushdowns set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v4_union as v,t2 where (v.a=t2.a) and ((t2.a<3) or (v.b<40)) and (v.c>500); a b c a b c d 1 33 1088 1 21 909 12 1 21 600 1 21 909 12 1 33 888 1 21 909 12 7 11 808 7 13 312 406 7 11 608 7 13 312 406 8 33 504 8 64 248 107 1 33 1088 1 19 203 107 1 21 600 1 19 203 107 1 33 888 1 19 203 107 8 33 504 8 80 800 314 select * from v4_union as v,t2 where (v.a=t2.a) and ((t2.a<3) or (v.b<40)) and (v.c>500); a b c a b c d 1 33 1088 1 21 909 12 1 21 600 1 21 909 12 1 33 888 1 21 909 12 7 11 808 7 13 312 406 7 11 608 7 13 312 406 8 33 504 8 64 248 107 1 33 1088 1 19 203 107 1 21 600 1 19 203 107 1 33 888 1 19 203 107 8 33 504 8 80 800 314 explain select * from v4_union as v,t2 where (v.a=t2.a) and ((t2.a<3) or (v.b<40)) and (v.c>500); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 5 test.t2.a 4 Using where 2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 UNION t1 ALL NULL NULL NULL NULL 20 Using where NULL UNION RESULT ALL NULL NULL NULL NULL NULL explain format=json select * from v4_union as v,t2 where (v.a=t2.a) and ((t2.a<3) or (v.b<40)) and (v.c>500); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["a"], "ref": ["test.t2.a"], "rows": 4, "filtered": 100, "attached_condition": "(t2.a < 3 or v.b < 40) and v.c > 500", "materialized": { "query_block": { "union_result": { "table_name": "", "access_type": "ALL", "query_specifications": [ { "query_block": { "select_id": 2, "having_condition": "c > 109 and c > 500", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 10 and (t1.a < 3 or t1.b < 40)" } } } } }, { "query_block": { "select_id": 3, "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.b > 10 and (t1.a < 3 or t1.b < 40) and t1.c + 100 > 500" } } } ] } } } } } } # using embedded derived table : pushing the same conditions # using several derived tables : pushing in all tables # conjunctive subformula : pushing into WHERE # extracted and formula : pushing into WHERE set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v4,v1 where (v4.a<13) and (v1.a>5) and (v1.b>12); a b min_c a b max_c avg_c 1 19 107 6 20 315 279.3333 1 21 500 6 20 315 279.3333 5 16 207 6 20 315 279.3333 5 27 132 6 20 315 279.3333 6 20 315 6 20 315 279.3333 8 33 404 6 20 315 279.3333 1 19 107 8 33 404 213.6667 1 21 500 8 33 404 213.6667 5 16 207 8 33 404 213.6667 5 27 132 8 33 404 213.6667 6 20 315 8 33 404 213.6667 8 33 404 8 33 404 213.6667 select * from v4,v1 where (v4.a<13) and (v1.a>5) and (v1.b>12); a b min_c a b max_c avg_c 1 19 107 6 20 315 279.3333 1 21 500 6 20 315 279.3333 5 16 207 6 20 315 279.3333 5 27 132 6 20 315 279.3333 6 20 315 6 20 315 279.3333 8 33 404 6 20 315 279.3333 1 19 107 8 33 404 213.6667 1 21 500 8 33 404 213.6667 5 16 207 8 33 404 213.6667 5 27 132 8 33 404 213.6667 6 20 315 8 33 404 213.6667 8 33 404 8 33 404 213.6667 explain select * from v4,v1 where (v4.a<13) and (v1.a>5) and (v1.b>12); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 4 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v4,v1 where (v4.a<13) and (v1.a>5) and (v1.b>12); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v4.a < 13", "materialized": { "query_block": { "select_id": 2, "filesort": { "sort_key": "v1.a, v1.b", "temporary_table": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a < 15 and v1.a < 13", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 15 and t1.a < 13" } } } } } } } } } } }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a > 5 and v1.b > 12" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "materialized": { "query_block": { "select_id": 4, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5 and t1.b > 12" } } } } } } } } # using embedded view : nothing to push # using several derived tables : pushing only in one table # conjunctive subformula : pushing into WHERE set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v4,v1,t2 where (v4.a=t2.a) and (v4.a=v1.a) and (v1.b>30); a b min_c a b max_c avg_c a b c d 8 33 404 8 33 404 213.6667 8 64 248 107 8 33 404 8 33 404 213.6667 8 80 800 314 select * from v4,v1,t2 where (v4.a=t2.a) and (v4.a=v1.a) and (v1.b>30); a b min_c a b max_c avg_c a b c d 8 33 404 8 33 404 213.6667 8 64 248 107 8 33 404 8 33 404 213.6667 8 80 800 314 explain select * from v4,v1,t2 where (v4.a=t2.a) and (v4.a=v1.a) and (v1.b>30); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key1 key1 5 test.t2.a 2 1 PRIMARY ref key0 key0 5 test.t2.a 2 Using where 4 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v4,v1,t2 where (v4.a=t2.a) and (v4.a=v1.a) and (v1.b>30); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a is not null and t2.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key1"], "key": "key1", "key_length": "5", "used_key_parts": ["a"], "ref": ["test.t2.a"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 2, "filesort": { "sort_key": "v1.a, v1.b", "temporary_table": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a < 15", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 15" } } } } } } } } } } }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["a"], "ref": ["test.t2.a"], "rows": 2, "filtered": 100, "attached_condition": "v1.b > 30", "materialized": { "query_block": { "select_id": 4, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.b > 30" } } } } } } } } # using embedded view : pushing different conditions # using several derived tables : pushing in all tables # conjunctive subformula : pushing into WHERE using equalities # extracted and formula : pushing into WHERE using equalities # conjunctive subformula : pushing into HAVING set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v4,v1,t2 where (v4.a=t2.a) and (v4.a>1) and (v4.a=v1.a) and (v4.min_c>100) and (v1.b<30); a b min_c a b max_c avg_c a b c d 6 20 315 6 20 315 279.3333 6 20 315 279 6 20 315 6 20 315 279.3333 6 23 303 909 select * from v4,v1,t2 where (v4.a=t2.a) and (v4.a>1) and (v4.a=v1.a) and (v4.min_c>100) and (v1.b<30); a b min_c a b max_c avg_c a b c d 6 20 315 6 20 315 279.3333 6 20 315 279 6 20 315 6 20 315 279.3333 6 23 303 909 explain select * from v4,v1,t2 where (v4.a=t2.a) and (v4.a>1) and (v4.a=v1.a) and (v4.min_c>100) and (v1.b<30); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key1 key1 5 test.t2.a 2 Using where 1 PRIMARY ref key0 key0 5 test.t2.a 2 Using where 4 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v4,v1,t2 where (v4.a=t2.a) and (v4.a>1) and (v4.a=v1.a) and (v4.min_c>100) and (v1.b<30); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.a > 1 and t2.a is not null and t2.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key1"], "key": "key1", "key_length": "5", "used_key_parts": ["a"], "ref": ["test.t2.a"], "rows": 2, "filtered": 100, "attached_condition": "v4.min_c > 100", "materialized": { "query_block": { "select_id": 2, "having_condition": "min_c > 100", "filesort": { "sort_key": "v1.a, v1.b", "temporary_table": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a < 15 and v1.a > 1", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 15 and t1.a > 1" } } } } } } } } } } }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["a"], "ref": ["test.t2.a"], "rows": 2, "filtered": 100, "attached_condition": "v1.b < 30", "materialized": { "query_block": { "select_id": 4, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 1 and t1.b < 30" } } } } } } } } # using embedded view : pushing different conditions # using several derived tables : pushing in all tables # extracted or formula : pushing into WHERE # conjunctive subformula : pushing into HAVING set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v4,v1,t2 where (((v4.b>10) and (v4.a>1)) or (v4.b<20)) and (v1.max_c>200) and (v1.a=v4.a); a b min_c a b max_c avg_c a b c d 1 19 107 1 21 500 234.6000 2 3 207 207 1 19 107 1 21 500 234.6000 1 21 909 12 1 19 107 1 21 500 234.6000 7 13 312 406 1 19 107 1 21 500 234.6000 8 64 248 107 1 19 107 1 21 500 234.6000 6 20 315 279 1 19 107 1 21 500 234.6000 1 19 203 107 1 19 107 1 21 500 234.6000 8 80 800 314 1 19 107 1 21 500 234.6000 3 12 231 190 1 19 107 1 21 500 234.6000 6 23 303 909 5 16 207 5 16 207 207.0000 2 3 207 207 5 16 207 5 16 207 207.0000 1 21 909 12 5 16 207 5 16 207 207.0000 7 13 312 406 5 16 207 5 16 207 207.0000 8 64 248 107 5 16 207 5 16 207 207.0000 6 20 315 279 5 16 207 5 16 207 207.0000 1 19 203 107 5 16 207 5 16 207 207.0000 8 80 800 314 5 16 207 5 16 207 207.0000 3 12 231 190 5 16 207 5 16 207 207.0000 6 23 303 909 5 27 132 5 16 207 207.0000 2 3 207 207 5 27 132 5 16 207 207.0000 1 21 909 12 5 27 132 5 16 207 207.0000 7 13 312 406 5 27 132 5 16 207 207.0000 8 64 248 107 5 27 132 5 16 207 207.0000 6 20 315 279 5 27 132 5 16 207 207.0000 1 19 203 107 5 27 132 5 16 207 207.0000 8 80 800 314 5 27 132 5 16 207 207.0000 3 12 231 190 5 27 132 5 16 207 207.0000 6 23 303 909 6 20 315 6 20 315 279.3333 2 3 207 207 6 20 315 6 20 315 279.3333 1 21 909 12 6 20 315 6 20 315 279.3333 7 13 312 406 6 20 315 6 20 315 279.3333 8 64 248 107 6 20 315 6 20 315 279.3333 6 20 315 279 6 20 315 6 20 315 279.3333 1 19 203 107 6 20 315 6 20 315 279.3333 8 80 800 314 6 20 315 6 20 315 279.3333 3 12 231 190 6 20 315 6 20 315 279.3333 6 23 303 909 8 33 404 8 33 404 213.6667 2 3 207 207 8 33 404 8 33 404 213.6667 1 21 909 12 8 33 404 8 33 404 213.6667 7 13 312 406 8 33 404 8 33 404 213.6667 8 64 248 107 8 33 404 8 33 404 213.6667 6 20 315 279 8 33 404 8 33 404 213.6667 1 19 203 107 8 33 404 8 33 404 213.6667 8 80 800 314 8 33 404 8 33 404 213.6667 3 12 231 190 8 33 404 8 33 404 213.6667 6 23 303 909 select * from v4,v1,t2 where (((v4.b>10) and (v4.a>1)) or (v4.b<20)) and (v1.max_c>200) and (v1.a=v4.a); a b min_c a b max_c avg_c a b c d 1 19 107 1 21 500 234.6000 2 3 207 207 1 19 107 1 21 500 234.6000 1 21 909 12 1 19 107 1 21 500 234.6000 7 13 312 406 1 19 107 1 21 500 234.6000 8 64 248 107 1 19 107 1 21 500 234.6000 6 20 315 279 1 19 107 1 21 500 234.6000 1 19 203 107 1 19 107 1 21 500 234.6000 8 80 800 314 1 19 107 1 21 500 234.6000 3 12 231 190 1 19 107 1 21 500 234.6000 6 23 303 909 5 16 207 5 16 207 207.0000 2 3 207 207 5 16 207 5 16 207 207.0000 1 21 909 12 5 16 207 5 16 207 207.0000 7 13 312 406 5 16 207 5 16 207 207.0000 8 64 248 107 5 16 207 5 16 207 207.0000 6 20 315 279 5 16 207 5 16 207 207.0000 1 19 203 107 5 16 207 5 16 207 207.0000 8 80 800 314 5 16 207 5 16 207 207.0000 3 12 231 190 5 16 207 5 16 207 207.0000 6 23 303 909 5 27 132 5 16 207 207.0000 2 3 207 207 5 27 132 5 16 207 207.0000 1 21 909 12 5 27 132 5 16 207 207.0000 7 13 312 406 5 27 132 5 16 207 207.0000 8 64 248 107 5 27 132 5 16 207 207.0000 6 20 315 279 5 27 132 5 16 207 207.0000 1 19 203 107 5 27 132 5 16 207 207.0000 8 80 800 314 5 27 132 5 16 207 207.0000 3 12 231 190 5 27 132 5 16 207 207.0000 6 23 303 909 6 20 315 6 20 315 279.3333 2 3 207 207 6 20 315 6 20 315 279.3333 1 21 909 12 6 20 315 6 20 315 279.3333 7 13 312 406 6 20 315 6 20 315 279.3333 8 64 248 107 6 20 315 6 20 315 279.3333 6 20 315 279 6 20 315 6 20 315 279.3333 1 19 203 107 6 20 315 6 20 315 279.3333 8 80 800 314 6 20 315 6 20 315 279.3333 3 12 231 190 6 20 315 6 20 315 279.3333 6 23 303 909 8 33 404 8 33 404 213.6667 2 3 207 207 8 33 404 8 33 404 213.6667 1 21 909 12 8 33 404 8 33 404 213.6667 7 13 312 406 8 33 404 8 33 404 213.6667 8 64 248 107 8 33 404 8 33 404 213.6667 6 20 315 279 8 33 404 8 33 404 213.6667 1 19 203 107 8 33 404 8 33 404 213.6667 8 80 800 314 8 33 404 8 33 404 213.6667 3 12 231 190 8 33 404 8 33 404 213.6667 6 23 303 909 explain select * from v4,v1,t2 where (((v4.b>10) and (v4.a>1)) or (v4.b<20)) and (v1.max_c>200) and (v1.a=v4.a); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where; Using join buffer (flat, BNL join) 1 PRIMARY ref key0 key0 5 v4.a 2 Using where 4 DERIVED t1 ALL NULL NULL NULL NULL 20 Using temporary; Using filesort 2 DERIVED ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v4,v1,t2 where (((v4.b>10) and (v4.a>1)) or (v4.b<20)) and (v1.max_c>200) and (v1.a=v4.a); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v4.b > 10 and v4.a > 1 or v4.b < 20" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "(v4.b > 10 and v4.a > 1 or v4.b < 20) and v4.a is not null", "materialized": { "query_block": { "select_id": 2, "filesort": { "sort_key": "v1.a, v1.b", "temporary_table": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a < 15 and (v1.b > 10 and v1.a > 1 or v1.b < 20)", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 15 and (t1.b > 10 and t1.a > 1 or t1.b < 20)" } } } } } } } } } } }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["a"], "ref": ["v4.a"], "rows": 2, "filtered": 100, "attached_condition": "v1.max_c > 200", "materialized": { "query_block": { "select_id": 4, "having_condition": "max_c < 707 and max_c > 200", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100 } } } } } } } } # using embedded view : pushing different conditions # using several derived tables : pushing only in one table # extracted or formula : pushing into WHERE # extracted or formula : pushing into HAVING set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v4,v2 where ((v4.a>12) and (v4.min_c<300) and (v4.b>13)) or (v4.a<1); a b min_c a b max_c avg_c select * from v4,v2 where ((v4.a>12) and (v4.min_c<300) and (v4.b>13)) or (v4.a<1); a b min_c a b max_c avg_c explain select * from v4,v2 where ((v4.a>12) and (v4.min_c<300) and (v4.b>13)) or (v4.a<1); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where 1 PRIMARY ALL NULL NULL NULL NULL 20 Using join buffer (flat, BNL join) 4 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v4,v2 where ((v4.a>12) and (v4.min_c<300) and (v4.b>13)) or (v4.a<1); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v4.a > 12 and v4.min_c < 300 and v4.b > 13 or v4.a < 1", "materialized": { "query_block": { "select_id": 2, "having_condition": "v1.a > 12 and min_c < 300 and v1.b > 13 or v1.a < 1", "filesort": { "sort_key": "v1.a, v1.b", "temporary_table": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a < 15 and (v1.a > 12 and v1.b > 13 or v1.a < 1)", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 15 and (t1.a > 12 and t1.b > 13 or t1.a < 1)" } } } } } } } } } } }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100 }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "materialized": { "query_block": { "select_id": 4, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5" } } } } } } } } # using embedded view : pushing different conditions # using several derived tables : pushing only in one table # conjunctive subformula : pushing into WHERE # conjunctive subformula : pushing into HAVING # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v4,v2 where (v4.a=v2.b) and (v4.a=v4.b) and (v4.min_c<100); a b min_c a b max_c avg_c select * from v4,v2 where (v4.a=v2.b) and (v4.a=v4.b) and (v4.min_c<100); a b min_c a b max_c avg_c explain select * from v4,v2 where (v4.a=v2.b) and (v4.a=v4.b) and (v4.min_c<100); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where 1 PRIMARY ref key0 key0 5 v4.a 2 4 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v4,v2 where (v4.a=v2.b) and (v4.a=v4.b) and (v4.min_c<100); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v4.b = v4.a and v4.min_c < 100 and v4.a is not null", "materialized": { "query_block": { "select_id": 2, "having_condition": "min_c < 100", "filesort": { "sort_key": "v1.a, v1.b", "temporary_table": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.b = v1.a and v1.a < 15", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.b = t1.a and t1.a < 15" } } } } } } } } } } }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["b"], "ref": ["v4.a"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 4, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5" } } } } } } } } # using embedded view : pushing the same conditions # using several derived tables : pushing in all tables # extracted and formula : pushing into WHERE using equalities # conjunctive subformula : pushing into WHERE # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v4,v2 where (v4.a=v2.b) and (v4.a=v4.b) and (v2.b<30); a b min_c a b max_c avg_c select * from v4,v2 where (v4.a=v2.b) and (v4.a=v4.b) and (v2.b<30); a b min_c a b max_c avg_c explain select * from v4,v2 where (v4.a=v2.b) and (v4.a=v4.b) and (v2.b<30); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where 1 PRIMARY ref key0 key0 5 v4.a 2 4 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v4,v2 where (v4.a=v2.b) and (v4.a=v4.b) and (v2.b<30); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v4.b = v4.a and v4.a < 30 and v4.a is not null", "materialized": { "query_block": { "select_id": 2, "filesort": { "sort_key": "v1.a, v1.b", "temporary_table": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.b = v1.a and v1.a < 15 and v1.a < 30", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.b = t1.a and t1.a < 15 and t1.a < 30" } } } } } } } } } } }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["b"], "ref": ["v4.a"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 4, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5 and t1.b < 30" } } } } } } } } # using embedded view : pushing the same conditions # using several derived tables : pushing in all tables # extracted or formula : pushing into WHERE using equalities # extracted and formula : pushing into WHERE using equalities # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v4,v2 where (v4.a=v2.b) and (v4.a=v4.b) and ((v2.b<30) or (v4.a>2)); a b min_c a b max_c avg_c select * from v4,v2 where (v4.a=v2.b) and (v4.a=v4.b) and ((v2.b<30) or (v4.a>2)); a b min_c a b max_c avg_c explain select * from v4,v2 where (v4.a=v2.b) and (v4.a=v4.b) and ((v2.b<30) or (v4.a>2)); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where 1 PRIMARY ref key0 key0 5 v4.a 2 4 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v4,v2 where (v4.a=v2.b) and (v4.a=v4.b) and ((v2.b<30) or (v4.a>2)); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v4.b = v4.a and (v4.a < 30 or v4.a > 2) and v4.a is not null", "materialized": { "query_block": { "select_id": 2, "filesort": { "sort_key": "v1.a, v1.b", "temporary_table": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.b = v1.a and v1.a < 15 and (v1.a < 30 or v1.a > 2)", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.b = t1.a and t1.a < 15 and (t1.a < 30 or t1.a > 2)" } } } } } } } } } } }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["b"], "ref": ["v4.a"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 4, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5 and (t1.b < 30 or t1.b > 2)" } } } } } } } } # using embedded view : pushing the same conditions # using several derived tables : pushing in all tables # extracted or formula : pushing into WHERE # conjunctive subformula : pushing into WHERE # pushing equalities set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v4,v2 where (((v4.a<12) and (v4.b>13)) or (v4.a>10)) and (v4.min_c=v2.max_c) and (v4.min_c>100); a b min_c a b max_c avg_c 6 20 315 6 20 315 279.3333 8 33 404 8 33 404 213.6667 select * from v4,v2 where (((v4.a<12) and (v4.b>13)) or (v4.a>10)) and (v4.min_c=v2.max_c) and (v4.min_c>100); a b min_c a b max_c avg_c 6 20 315 6 20 315 279.3333 8 33 404 8 33 404 213.6667 explain select * from v4,v2 where (((v4.a<12) and (v4.b>13)) or (v4.a>10)) and (v4.min_c=v2.max_c) and (v4.min_c>100); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY ALL NULL NULL NULL NULL 20 Using where 1 PRIMARY ref key0 key0 5 v4.min_c 2 4 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v4,v2 where (((v4.a<12) and (v4.b>13)) or (v4.a>10)) and (v4.min_c=v2.max_c) and (v4.min_c>100); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "(v4.a < 12 and v4.b > 13 or v4.a > 10) and v4.min_c > 100 and v4.min_c is not null", "materialized": { "query_block": { "select_id": 2, "having_condition": "min_c > 100", "filesort": { "sort_key": "v1.a, v1.b", "temporary_table": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a < 15 and (v1.a < 12 and v1.b > 13 or v1.a > 10)", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 15 and (t1.a < 12 and t1.b > 13 or t1.a > 10)" } } } } } } } } } } }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["max_c"], "ref": ["v4.min_c"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 4, "having_condition": "max_c < 707 and max_c > 100", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5" } } } } } } } } # using embedded view : pushing the same conditions # using several derived tables : pushing only in one table # extracted or formula : pushing into WHERE set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v4,v2,t2 where (((v4.a<12) and (t2.b>13)) or (v4.a>10)) and (v4.min_c=t2.c) and (t2.c>100); a b min_c a b max_c avg_c a b c d 6 20 315 6 20 315 279.3333 6 20 315 279 6 20 315 8 33 404 213.6667 6 20 315 279 select * from v4,v2,t2 where (((v4.a<12) and (t2.b>13)) or (v4.a>10)) and (v4.min_c=t2.c) and (t2.c>100); a b min_c a b max_c avg_c a b c d 6 20 315 6 20 315 279.3333 6 20 315 279 6 20 315 8 33 404 213.6667 6 20 315 279 explain select * from v4,v2,t2 where (((v4.a<12) and (t2.b>13)) or (v4.a>10)) and (v4.min_c=t2.c) and (t2.c>100); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where 1 PRIMARY ref key0 key0 5 test.t2.c 2 Using where 1 PRIMARY ALL NULL NULL NULL NULL 20 Using join buffer (flat, BNL join) 4 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 2 DERIVED ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort explain format=json select * from v4,v2,t2 where (((v4.a<12) and (t2.b>13)) or (v4.a>10)) and (v4.min_c=t2.c) and (t2.c>100); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.c > 100 and t2.c is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["min_c"], "ref": ["test.t2.c"], "rows": 2, "filtered": 100, "attached_condition": "v4.a < 12 and t2.b > 13 or v4.a > 10", "materialized": { "query_block": { "select_id": 2, "having_condition": "min_c > 100", "filesort": { "sort_key": "v1.a, v1.b", "temporary_table": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "v1.a < 15 and (v1.a < 12 or v1.a > 10)", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a < 15 and (t1.a < 12 or t1.a > 10)" } } } } } } } } } } }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 20, "filtered": 100 }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "materialized": { "query_block": { "select_id": 4, "having_condition": "max_c < 707", "filesort": { "sort_key": "t1.a, t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 20, "filtered": 100, "attached_condition": "t1.a > 5" } } } } } } } } drop view v1,v2,v3,v4; drop view v_union,v2_union,v3_union,v4_union; drop view v_double,v_char,v_decimal; drop table t1,t2,t1_double,t2_double,t1_char,t2_char,t1_decimal,t2_decimal; # # MDEV-10782: condition extracted from a multiple equality # pushed into HAVING # CREATE TABLE t1 (i int); INSERT INTO t1 VALUES (1),(2); EXPLAIN EXTENDED SELECT * FROM ( SELECT * FROM ( SELECT MIN(i) as f FROM t1 ) sq1 ) AS sq2 WHERE f = 8; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY ALL NULL NULL NULL NULL 2 100.00 Using where 3 DERIVED t1 ALL NULL NULL NULL NULL 2 100.00 Warnings: Note 1003 select `sq1`.`f` AS `f` from (select min(`test`.`t1`.`i`) AS `f` from `test`.`t1` having `f` = 8) `sq1` where `sq1`.`f` = 8 SELECT * FROM ( SELECT * FROM ( SELECT MIN(i) as f FROM t1 ) sq1 ) AS sq2 WHERE f = 8; f SELECT * FROM ( SELECT * FROM ( SELECT MIN(i) as f FROM t1 ) sq1 ) AS sq2 WHERE f = 1; f 1 DROP TABLE t1; # # MDEV-10783: pushdown into constant view # CREATE TABLE t1 (i int) ENGINE=MyISAM; CREATE VIEW v AS SELECT 5; SELECT * FROM t1 WHERE 1 IN ( SELECT * FROM v ); i DROP VIEW v; DROP TABLE t1; # # MDEV-10785: second execution of a query with condition # pushed into view # CREATE TABLE t1 (i int); CREATE VIEW v1 AS SELECT i FROM t1 WHERE i < 5; CREATE FUNCTION f (in1 int) RETURNS int RETURN in1; CREATE VIEW v2 AS SELECT * FROM v1 GROUP BY i; PREPARE stmt FROM "SELECT * FROM v2 WHERE f(0) <> 2"; EXECUTE stmt; i EXECUTE stmt; i DROP FUNCTION f; DROP VIEW v2,v1; DROP TABLE t1; # # MDEV-10884: condition pushdown into derived specified by # 1. unit with SELECT containing ORDER BY ... LIMIT # 2. unit containing global ORDER BY ... LIMIT # create table t1(a int); insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); select a from t1 order by a limit 5; a 0 1 2 3 4 set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from (select a from t1 order by a limit 5) t where t.a not in (1,2,3); a 0 4 set statement optimizer_switch='condition_pushdown_for_derived=on' for select * from (select a from t1 order by a limit 5) t where t.a not in (1,2,3); a 0 4 select a from t1 where a < 4 union select a from t1 where a > 5 order by a limit 5; a 0 1 2 3 6 set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from (select a from t1 where a < 4 union select a from t1 where a > 5 order by a limit 5) t where t.a not in (2,9); a 0 1 3 6 set statement optimizer_switch='condition_pushdown_for_derived=on' for select * from (select a from t1 where a < 4 union select a from t1 where a > 5 order by a limit 5) t where t.a not in (2,9); a 0 1 3 6 drop table t1; # # MDEV-11072: pushdown of the condition obtained # after constant row substitution # CREATE TABLE t1 (a INT) ENGINE=MyISAM; CREATE TABLE t2 (b INT) ENGINE=MyISAM; CREATE OR REPLACE VIEW v2 AS SELECT * FROM t2; CREATE TABLE t3 (c INT) ENGINE=MyISAM; CREATE OR REPLACE ALGORITHM=TEMPTABLE VIEW v3 AS SELECT * FROM t3; SELECT * FROM t1 WHERE a IN ( SELECT b FROM v2 WHERE b < a OR b IN ( SELECT c FROM v3 WHERE c = a ) ); a INSERT INTO t1 VALUES (2); INSERT INTO t2 VALUES (3), (2); INSERT INTO t3 VALUES (4), (1), (2), (7); SELECT * FROM t1 WHERE a IN ( SELECT b FROM v2 WHERE b < a OR b IN ( SELECT c FROM v3 WHERE c = a ) ); a 2 EXPLAIN FORMAT=JSON SELECT * FROM t1 WHERE a IN ( SELECT b FROM v2 WHERE b < a OR b IN ( SELECT c FROM v3 WHERE c = a ) ); EXPLAIN { "query_block": { "select_id": 1, "const_condition": "0 or (2,(subquery#3))", "table": { "table_name": "t1", "access_type": "system", "rows": 1, "filtered": 100 }, "table": { "table_name": "t2", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "t2.b = 2", "first_match": "t1" }, "subqueries": [ { "query_block": { "select_id": 3, "table": { "table_name": "", "access_type": "index_subquery", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["c"], "ref": ["func"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 5, "table": { "table_name": "t3", "access_type": "ALL", "rows": 4, "filtered": 100, "attached_condition": "t3.c = 2" } } } } } } ] } } CREATE TABLE t4 (d INT, e INT) ENGINE=MyISAM; INSERT INTO t4 VALUES (1,10),(3,11),(2,10),(2,20),(3,21); CREATE OR REPLACE VIEW v4 AS SELECT d, sum(e) AS s FROM t4 GROUP BY d; set statement optimizer_switch='condition_pushdown_for_derived=off' for SELECT * FROM t1 WHERE a IN ( SELECT b FROM v2 WHERE b < a OR b IN ( SELECT d FROM v4 WHERE s > a ) ); a 2 SELECT * FROM t1 WHERE a IN ( SELECT b FROM v2 WHERE b < a OR b IN ( SELECT d FROM v4 WHERE s > a ) ); a 2 explain SELECT * FROM t1 WHERE a IN ( SELECT b FROM v2 WHERE b < a OR b IN ( SELECT d FROM v4 WHERE s > a ) ); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 system NULL NULL NULL NULL 1 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where; FirstMatch(t1) 3 DEPENDENT SUBQUERY index_subquery key0 key0 5 func 2 Using where 5 DERIVED t4 ALL NULL NULL NULL NULL 5 Using temporary; Using filesort explain format=json SELECT * FROM t1 WHERE a IN ( SELECT b FROM v2 WHERE b < a OR b IN ( SELECT d FROM v4 WHERE s > a ) ); EXPLAIN { "query_block": { "select_id": 1, "const_condition": "0 or (2,(subquery#3))", "table": { "table_name": "t1", "access_type": "system", "rows": 1, "filtered": 100 }, "table": { "table_name": "t2", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "t2.b = 2", "first_match": "t1" }, "subqueries": [ { "query_block": { "select_id": 3, "table": { "table_name": "", "access_type": "index_subquery", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["d"], "ref": ["func"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 5, "having_condition": "s > 2", "filesort": { "sort_key": "t4.d", "temporary_table": { "table": { "table_name": "t4", "access_type": "ALL", "rows": 5, "filtered": 100 } } } } } } } } ] } } DROP VIEW v2,v3,v4; DROP TABLE t1,t2,t3,t4; # # MDEV-10800: pushdown of the condition obtained # after constant row substitution # CREATE TABLE t1 (a INT) ENGINE=MyISAM; INSERT INTO t1 VALUES (1); CREATE TABLE t2 (b INT) ENGINE=MyISAM; INSERT INTO t2 VALUES (3),(4); CREATE OR REPLACE ALGORITHM=TEMPTABLE VIEW v2 AS SELECT * FROM t2; SELECT * FROM ( SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM v2 WHERE b = a ) ) AS sq; a EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT * FROM t1 WHERE EXISTS ( SELECT * FROM v2 WHERE b = a ) ) AS sq; EXPLAIN { "query_block": { "select_id": 1, "const_condition": "(1,exists(subquery#3))", "table": { "table_name": "t1", "access_type": "system", "rows": 1, "filtered": 100 }, "subqueries": [ { "query_block": { "select_id": 3, "table": { "table_name": "", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "v2.b = 1", "materialized": { "query_block": { "select_id": 4, "table": { "table_name": "t2", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "t2.b = 1" } } } } } } ] } } DROP VIEW v2; DROP TABLE t1,t2; # # MDEV-11102: condition pushdown into materialized inner table # of outer join is not applied as not being valid # CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (0),(2); CREATE TABLE t2 (b INT); INSERT INTO t2 VALUES (1),(2); CREATE OR REPLACE ALGORITHM=TEMPTABLE VIEW v2 AS SELECT * FROM t2; SELECT * FROM t1 LEFT JOIN t2 ON a = b WHERE b IS NULL; a b 0 NULL SELECT * FROM t1 LEFT JOIN v2 ON a = b WHERE b IS NULL; a b 0 NULL EXPLAIN FORMAT=JSON SELECT * FROM t1 LEFT JOIN v2 ON a = b WHERE b IS NULL; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100 }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["b"], "ref": ["test.t1.a"], "rows": 2, "filtered": 100, "attached_condition": "trigcond(v2.b is null) and trigcond(trigcond(t1.a is not null))", "materialized": { "query_block": { "select_id": 2, "table": { "table_name": "t2", "access_type": "ALL", "rows": 2, "filtered": 100 } } } } } } DROP VIEW v2; DROP TABLE t1,t2; # # MDEV-11103: pushdown condition with ANY subquery # CREATE TABLE t1 (i INT); CREATE OR REPLACE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1; INSERT INTO t1 VALUES (1),(2); EXPLAIN FORMAT=JSON SELECT * FROM v1 WHERE i <= ANY ( SELECT 3 ); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "(v1.i <= 3)", "materialized": { "query_block": { "select_id": 3, "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "(t1.i <= 3)" } } } } } } Warnings: Note 1249 Select 2 was reduced during optimization SELECT * FROM v1 WHERE i <= ANY ( SELECT 3 ); i 1 2 DROP VIEW v1; DROP TABLE t1; # # MDEV-11315: condition with outer reference to mergeable derived # CREATE TABLE t1 (pk1 INT PRIMARY KEY, a INT, b INT) ENGINE=MyISAM; INSERT INTO t1 VALUES (10,7,1),(11,0,2); CREATE TABLE t2 (pk2 INT PRIMARY KEY, c INT, d DATETIME) ENGINE=MyISAM; INSERT INTO t2 VALUES (1,4,'2008-09-27 00:34:58'), (2,5,'2007-05-28 00:00:00'), (3,6,'2009-07-25 09:21:20'); CREATE VIEW v1 AS SELECT * FROM t1; CREATE ALGORITHM=TEMPTABLE VIEW v2 AS SELECT * FROM t2; SELECT * FROM v1 AS sq WHERE b IN ( SELECT pk2 FROM v2 WHERE c > sq.b ) OR b = 100; pk1 a b 10 7 1 11 0 2 EXPLAIN FORMAT=JSON SELECT * FROM v1 AS sq WHERE b IN ( SELECT pk2 FROM v2 WHERE c > sq.b ) OR b = 100; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "(t1.b,(subquery#2)) or t1.b = 100" }, "subqueries": [ { "query_block": { "select_id": 2, "table": { "table_name": "", "access_type": "index_subquery", "possible_keys": ["key0"], "key": "key0", "key_length": "4", "used_key_parts": ["pk2"], "ref": ["func"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 4, "table": { "table_name": "t2", "access_type": "ALL", "rows": 3, "filtered": 100 } } } } } } ] } } SELECT * FROM ( SELECT * FROM t1 ) AS sq WHERE b IN ( SELECT pk2 FROM v2 WHERE c > sq.b ) OR b = 100; pk1 a b 10 7 1 11 0 2 EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT * FROM t1 ) AS sq WHERE b IN ( SELECT pk2 FROM v2 WHERE c > sq.b ) OR b = 100; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "(t1.b,(subquery#3)) or t1.b = 100" }, "subqueries": [ { "query_block": { "select_id": 3, "table": { "table_name": "", "access_type": "index_subquery", "possible_keys": ["key0"], "key": "key0", "key_length": "4", "used_key_parts": ["pk2"], "ref": ["func"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 4, "table": { "table_name": "t2", "access_type": "ALL", "rows": 3, "filtered": 100 } } } } } } ] } } DROP VIEW v1,v2; DROP TABLE t1,t2; # # MDEV-11313: pushdown of the condition obtained # after constant row substitution # CREATE TABLE t1 (a INT) ENGINE=MyISAM; INSERT INTO t1 VALUES (1),(2); CREATE TABLE t2 (b INT) ENGINE=MyISAM; INSERT INTO t2 VALUES (50); CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1; SELECT ( SELECT COUNT(*) FROM v1 WHERE a = t2.b ) AS f FROM t2 GROUP BY f; f 0 EXPLAIN FORMAT=JSON SELECT ( SELECT COUNT(*) FROM v1 WHERE a = t2.b ) AS f FROM t2 GROUP BY f; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "system", "rows": 1, "filtered": 100 }, "subqueries": [ { "query_block": { "select_id": 2, "table": { "table_name": "", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "v1.a = 50", "materialized": { "query_block": { "select_id": 3, "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "t1.a = 50" } } } } } } ] } } CREATE TABLE t3 (a INT, b INT) ENGINE=MYISAM; INSERT INTO t3 VALUES (1,10),(3,11),(2,10),(2,20),(3,21); CREATE VIEW v2 AS SELECT a, sum(b) AS s FROM t3 GROUP BY a ; SELECT ( SELECT COUNT(*) FROM v2 WHERE s < t2.b ) AS f FROM t2 GROUP BY f; f 3 EXPLAIN FORMAT=JSON SELECT ( SELECT COUNT(*) FROM v2 WHERE s < t2.b ) AS f FROM t2 GROUP BY f; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "system", "rows": 1, "filtered": 100 }, "subqueries": [ { "query_block": { "select_id": 2, "table": { "table_name": "", "access_type": "ALL", "rows": 5, "filtered": 100, "attached_condition": "v2.s < 50", "materialized": { "query_block": { "select_id": 3, "having_condition": "s < 50", "filesort": { "sort_key": "t3.a", "temporary_table": { "table": { "table_name": "t3", "access_type": "ALL", "rows": 5, "filtered": 100 } } } } } } } } ] } } DROP VIEW v1,v2; DROP TABLE t1,t2,t3; # # MDEV-10882: pushdown of the predicate with cached value # CREATE TABLE t1 (a INT NOT NULL, b INT NOT NULL) ENGINE=MyISAM; CREATE OR REPLACE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1; INSERT INTO t1 VALUES (1,2),(3,4); CREATE TABLE t2 (c INT NOT NULL) ENGINE=MyISAM; INSERT INTO t2 VALUES (5),(6); SELECT a, GROUP_CONCAT(b) FROM v1 WHERE b IN ( SELECT COUNT(c) FROM t2 ) GROUP BY a; a GROUP_CONCAT(b) 1 2 EXPLAIN FORMAT=JSON SELECT a, GROUP_CONCAT(b) FROM v1 WHERE b IN ( SELECT COUNT(c) FROM t2 ) GROUP BY a; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "system", "rows": 1, "filtered": 100, "materialized": { "unique": 1, "query_block": { "select_id": 2, "table": { "message": "Select tables optimized away" } } } }, "read_sorted_file": { "filesort": { "sort_key": "v1.a", "table": { "table_name": "", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "v1.b = 2", "materialized": { "query_block": { "select_id": 3, "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "t1.b = 2" } } } } } } } } DROP VIEW v1; DROP TABLE t1,t2; # # MDEV-10836: pushdown of the predicate with cached value # CREATE TABLE t (pk INT PRIMARY KEY, f INT) ENGINE=MyISAM; CREATE ALGORITHM=TEMPTABLE VIEW v AS SELECT * FROM t; INSERT INTO t VALUES (1,1),(3,2); SELECT * FROM v AS v1, v AS v2 WHERE v2.pk > v1.f AND v1.f IN ( SELECT COUNT(pk) FROM t ); pk f pk f 3 2 3 2 EXPLAIN FORMAT=JSON SELECT * FROM v AS v1, v AS v2 WHERE v2.pk > v1.f AND v1.f IN ( SELECT COUNT(pk) FROM t ); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "system", "rows": 1, "filtered": 100, "materialized": { "unique": 1, "query_block": { "select_id": 2, "table": { "message": "Select tables optimized away" } } } }, "table": { "table_name": "", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "v1.f = 2", "materialized": { "query_block": { "select_id": 3, "table": { "table_name": "t", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "t.f = 2" } } } }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "v2.pk > 2" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "materialized": { "query_block": { "select_id": 4, "table": { "table_name": "t", "access_type": "range", "possible_keys": ["PRIMARY"], "key": "PRIMARY", "key_length": "4", "used_key_parts": ["pk"], "rows": 2, "filtered": 100, "index_condition": "t.pk > 2" } } } } } } DROP VIEW v; DROP TABLE t; # # MDEV-11488: pushdown of the predicate with cached value # CREATE TABLE t1 (i INT) ENGINE=MyISAM; INSERT INTO t1 VALUES (1),(3),(2); CREATE TABLE t2 (j INT, KEY(j)) ENGINE=MyISAM; INSERT INTO t2 VALUES (3),(4); SELECT * FROM ( SELECT DISTINCT * FROM t1 ) AS sq WHERE i IN ( SELECT MIN(j) FROM t2 ); i 3 EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT DISTINCT * FROM t1 ) AS sq WHERE i IN ( SELECT MIN(j) FROM t2 ); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "system", "rows": 1, "filtered": 100, "materialized": { "unique": 1, "query_block": { "select_id": 3, "table": { "message": "Select tables optimized away" } } } }, "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "sq.i = 3", "materialized": { "query_block": { "select_id": 2, "table": { "table_name": "t1", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "t1.i = 3" } } } } } } UPDATE t2 SET j = 2 WHERE j = 3; SELECT * FROM ( SELECT DISTINCT * FROM t1 ) AS sq WHERE i IN ( SELECT MIN(j) FROM t2 ); i 2 DROP TABLE t1,t2; CREATE TABLE t1 (i FLOAT) ENGINE=MyISAM; INSERT INTO t1 VALUES (1.5),(3.2),(2.71); CREATE TABLE t2 (j FLOAT, KEY(j)) ENGINE=MyISAM; INSERT INTO t2 VALUES (3.2),(2.71); SELECT * FROM ( SELECT DISTINCT * FROM t1 ) AS sq WHERE i IN ( SELECT MIN(j) FROM t2 ); i 2.71 EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT DISTINCT * FROM t1 ) AS sq WHERE i IN ( SELECT MIN(j) FROM t2 ); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "system", "rows": 1, "filtered": 100, "materialized": { "unique": 1, "query_block": { "select_id": 3, "table": { "message": "Select tables optimized away" } } } }, "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "sq.i = 2.7100000381469727", "materialized": { "query_block": { "select_id": 2, "table": { "table_name": "t1", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "t1.i = 2.7100000381469727" } } } } } } DROP TABLE t1,t2; CREATE TABLE t1 (i DECIMAL(10,2)) ENGINE=MyISAM; INSERT INTO t1 VALUES (1.5),(3.21),(2.47); CREATE TABLE t2 (j DECIMAL(10,2), KEY(j)) ENGINE=MyISAM; INSERT INTO t2 VALUES (3.21),(4.55); SELECT * FROM ( SELECT DISTINCT * FROM t1 ) AS sq WHERE i IN ( SELECT MIN(j) FROM t2 ); i 3.21 EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT DISTINCT * FROM t1 ) AS sq WHERE i IN ( SELECT MIN(j) FROM t2 ); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "system", "rows": 1, "filtered": 100, "materialized": { "unique": 1, "query_block": { "select_id": 3, "table": { "message": "Select tables optimized away" } } } }, "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "sq.i = 3.21", "materialized": { "query_block": { "select_id": 2, "table": { "table_name": "t1", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "t1.i = 3.21" } } } } } } DROP TABLE t1,t2; CREATE TABLE t1 (i VARCHAR(32)) ENGINE=MyISAM; INSERT INTO t1 VALUES ('cc'),('aa'),('ddd'); CREATE TABLE t2 (j VARCHAR(16), KEY(j)) ENGINE=MyISAM; INSERT INTO t2 VALUES ('bbb'),('aa'); SELECT * FROM ( SELECT DISTINCT * FROM t1 ) AS sq WHERE i IN ( SELECT MIN(j) FROM t2 ); i aa EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT DISTINCT * FROM t1 ) AS sq WHERE i IN ( SELECT MIN(j) FROM t2 ); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "system", "rows": 1, "filtered": 100, "materialized": { "unique": 1, "query_block": { "select_id": 3, "table": { "message": "Select tables optimized away" } } } }, "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "sq.i = 'aa'", "materialized": { "query_block": { "select_id": 2, "table": { "table_name": "t1", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "t1.i = 'aa'" } } } } } } DROP TABLE t1,t2; CREATE TABLE t1 (i DATETIME) ENGINE=MyISAM; INSERT INTO t1 VALUES ('2008-09-27 00:34:58'),('2007-05-28 00:00:00'), ('2009-07-25 09:21:20'); CREATE TABLE t2 (j DATETIME, KEY(j)) ENGINE=MyISAM; INSERT INTO t2 VALUES ('2007-05-28 00:00:00'), ('2010-08-25 00:00:00'); SELECT * FROM ( SELECT DISTINCT * FROM t1 ) AS sq WHERE i IN ( SELECT MIN(j) FROM t2 ); i 2007-05-28 00:00:00 EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT DISTINCT * FROM t1 ) AS sq WHERE i IN ( SELECT MIN(j) FROM t2 ); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "system", "rows": 1, "filtered": 100, "materialized": { "unique": 1, "query_block": { "select_id": 3, "table": { "message": "Select tables optimized away" } } } }, "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "sq.i = '2007-05-28 00:00:00'", "materialized": { "query_block": { "select_id": 2, "table": { "table_name": "t1", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "t1.i = TIMESTAMP'2007-05-28 00:00:00'" } } } } } } DROP TABLE t1,t2; CREATE TABLE t1 (i DATE) ENGINE=MyISAM; INSERT INTO t1 VALUES ('2008-09-27'),('2007-05-28'), ('2009-07-25'); CREATE TABLE t2 (j DATE, KEY(j)) ENGINE=MyISAM; INSERT INTO t2 VALUES ('2007-05-28'), ('2010-08-25'); SELECT * FROM ( SELECT DISTINCT * FROM t1 ) AS sq WHERE i IN ( SELECT MIN(j) FROM t2 ); i 2007-05-28 EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT DISTINCT * FROM t1 ) AS sq WHERE i IN ( SELECT MIN(j) FROM t2 ); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "system", "rows": 1, "filtered": 100, "materialized": { "unique": 1, "query_block": { "select_id": 3, "table": { "message": "Select tables optimized away" } } } }, "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "sq.i = '2007-05-28'", "materialized": { "query_block": { "select_id": 2, "table": { "table_name": "t1", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "t1.i = TIMESTAMP'2007-05-28 00:00:00'" } } } } } } DROP TABLE t1,t2; CREATE TABLE t1 (i TIME) ENGINE=MyISAM; INSERT INTO t1 VALUES ('00:34:58'),('10:00:02'), ('09:21:20'); CREATE TABLE t2 (j TIME, KEY(j)) ENGINE=MyISAM; INSERT INTO t2 VALUES ('10:00:02'), ('11:00:10'); SELECT * FROM ( SELECT DISTINCT * FROM t1 ) AS sq WHERE i IN ( SELECT MIN(j) FROM t2 ); i 10:00:02 EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT DISTINCT * FROM t1 ) AS sq WHERE i IN ( SELECT MIN(j) FROM t2 ); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "system", "rows": 1, "filtered": 100, "materialized": { "unique": 1, "query_block": { "select_id": 3, "table": { "message": "Select tables optimized away" } } } }, "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "sq.i = '10:00:02'", "materialized": { "query_block": { "select_id": 2, "table": { "table_name": "t1", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "t1.i = TIME'10:00:02'" } } } } } } DROP TABLE t1,t2; # # MDEV-11593: pushdown of condition with NULLIF # CREATE TABLE t1 (i INT); CREATE OR REPLACE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1; INSERT INTO t1 VALUES (2), (1); SELECT * FROM v1 WHERE NULLIF(1, i); i 2 EXPLAIN FORMAT=JSON SELECT * FROM v1 WHERE NULLIF(1, i); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "nullif(1,v1.i)", "materialized": { "query_block": { "select_id": 2, "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "nullif(1,t1.i)" } } } } } } DROP VIEW v1; DROP TABLE t1; # # MDEV-11608: pushdown of the predicate with cached null value # CREATE TABLE t1 (c VARCHAR(3)); CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1; INSERT INTO t1 VALUES ('foo'),('bar'); CREATE TABLE t2 (c VARCHAR(3)); INSERT INTO t2 VALUES ('foo'),('xyz'); SELECT * FROM v1 WHERE v1.c IN ( SELECT MIN(c) FROM t2 WHERE 0 ); c EXPLAIN FORMAT=JSON SELECT * FROM v1 WHERE v1.c IN ( SELECT MIN(c) FROM t2 WHERE 0 ); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "system", "rows": 1, "filtered": 100, "materialized": { "unique": 1, "query_block": { "select_id": 2, "table": { "message": "Impossible WHERE" } } } }, "table": { "table_name": "", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "v1.c = NULL", "materialized": { "query_block": { "select_id": 3, "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "t1.c = NULL" } } } } } } DROP VIEW v1; DROP TABLE t1,t2; CREATE TABLE t1 (d DECIMAL(10,2)); CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1; INSERT INTO t1 VALUES (5.37),(1.1); CREATE TABLE t2 (d DECIMAL(10,2)); INSERT INTO t2 VALUES ('1.1'),('2.23'); SELECT * FROM v1 WHERE v1.d IN ( SELECT MIN(d) FROM t2 WHERE 0 ); d DROP VIEW v1; DROP TABLE t1,t2; # # MDEV-11820: second execution of PS for query # with false subquery predicate in WHERE # CREATE TABLE t1 (c VARCHAR(3)) ENGINE=MyISAM; INSERT INTO t1 VALUES ('foo'),('bar'); CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1; CREATE TABLE t2 (a INT); INSERT INTO t2 VALUES (3), (4); PREPARE stmt1 FROM " SELECT * FROM v1 WHERE 1 IN (SELECT a FROM t2) OR c = 'foo'"; PREPARE stmt2 FROM "EXPLAIN FORMAT=JSON SELECT * FROM v1 WHERE 1 IN (SELECT a FROM t2) OR c = 'foo'"; EXECUTE stmt1; c foo EXECUTE stmt2; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "v1.c = 'foo'", "materialized": { "query_block": { "select_id": 3, "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "t1.c = 'foo'" } } } }, "subqueries": [ { "query_block": { "select_id": 2, "table": { "table_name": "t2", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "1 = t2.a" } } } ] } } INSERT INTO t2 SELECT a+1 FROM t2; INSERT INTO t2 SELECT a+1 FROM t2; INSERT INTO t2 SELECT a+1 FROM t2; INSERT INTO t2 SELECT a+1 FROM t2; INSERT INTO t2 SELECT a+1 FROM t2; INSERT INTO t2 SELECT a+1 FROM t2; EXECUTE stmt1; c foo EXECUTE stmt2; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "((1,(subquery#2))) or v1.c = 'foo'", "materialized": { "query_block": { "select_id": 3, "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100 } } } }, "subqueries": [ { "query_block": { "select_id": 2, "table": { "table_name": "t2", "access_type": "ALL", "rows": 128, "filtered": 100, "attached_condition": "1 = t2.a" } } } ] } } DEALLOCATE PREPARE stmt1; DEALLOCATE PREPARE stmt2; DROP VIEW v1; DROP TABLE t1,t2; # # MDEV-12373: pushdown into derived with side effects is prohibited # CREATE TABLE sales_documents ( id int NOT NULL AUTO_INCREMENT, sale_id int NULL DEFAULT NULL, type tinyint unsigned NULL DEFAULT NULL, data text NULL DEFAULT NULL COLLATE 'utf8_unicode_ci', date date NULL DEFAULT NULL, order_number int unsigned NULL DEFAULT NULL, created_at int NULL DEFAULT NULL, updated_at int NULL DEFAULT NULL, generated tinyint NOT NULL DEFAULT '0', synced_at int NOT NULL DEFAULT '0', sum decimal(13,2) NOT NULL DEFAULT '0', PRIMARY KEY (id) ); INSERT INTO sales_documents (id, sale_id, type, order_number, data, created_at, updated_at, date, generated, synced_at, sum) VALUES (555, 165, 3, 5, '{}', 1486538300, 1486722835, '2017-02-17', 0, 1486538313, 2320.00), (556, 165, 2, 3, '{}', 1486538304, 1486563125, '2017-02-08', 1, 1486538302, 2320.00), (557, 158, 2, 2, '{}', 1486538661, 1486538661, '2017-02-08', 0, 1486538660, 2320.00), (558, 171, 1, 3, '{}', 1486539104, 1488203405, '2017-02-08', 1, 1486539102, 23230.00), (559, 171, 2, 5, '{}', 1486549233, 1487146010, '2017-02-08', 1, 1486549225, 37690.00), (560, 172, 1, 1, '{}', 1486658260, 1488203409, '2017-02-09', 1, 1486658256, 40312.00), (561, 172, 2, 1, '{}', 1486711997, 1486711997, '2017-02-10', 1, 1486711996, 40312.00), (562, 172, 3, 1, '{}', 1486712104, 1486721395, '2017-02-10', 1, 1486712101, 40312.00), (563, 171, 3, 2, '{}', 1486712953, 1486720244, '2017-02-10', 1, 1486712910, 23230.00), (564, 170, 1, 2, '{}', 1486715948, 1488203410, '2017-02-10', 1, 1486715930, 28873.00), (565, 170, 3, 3, '{}', 1486716782, 1486717426, '2017-02-10', 1, 1486716779, 61948.00), (566, 166, 3, 4, '{}', 1486720947, 1486720947, '2017-02-10', 1, 1486720945, 4640.00), (567, 167, 3, 5, '{}', 1486722741, 1486722783, '2017-02-26', 0, 1486722738, 14755.00), (568, 165, 1, 4, '{}', 1486722849, 1486722849, '2017-02-10', 0, 1486722846, 2320.00), (569, 173, 2, 2, '{}', 1486723073, 1487071275, '2017-02-10', 1, 1486723071, 14282.00), (570, 173, 1, 4, '{}', 1486723100, 1488203412, '2017-02-10', 1, 1486723099, 14282.00), (571, 167, 2, 4, '{}', 1486730859, 1486730859, '2017-02-10', 1, 1486730856, 18655.00), (572, 167, 1, 5, '{}', 1486730883, 1488203412, '2017-02-10', 1, 1486730877, 18655.00), (573, 174, 2, 51, '{}', 1486731622, 1487060259, '2017-02-10', 1, 1486731620, 7140.00), (574, 174, 3, 5, '{}', 1486993472, 1486993472, '2017-02-13', 1, 1488216147, 28020.00), (575, 174, 1, 6, '{}', 1486993530, 1488203412, '2017-02-13', 1, 1486993505, 7140.00), (576, 173, 3, 6, '{}', 1487071425, 1487071425, '2017-02-14', 0, 1487071422, 14282.00), (577, 178, 2, 6, '{}', 1487327372, 1487327372, '2017-02-17', 1, 1487327370, 12321.00), (578, 177, 2, 7, '{}', 1487327394, 1487327394, '2017-02-17', 0, 1487327391, 4270.00), (579, 182, 3, 6, '{}', 1487750589, 1487751693, '2017-02-22', 1, 1487751688, 4270.00), (580, 182, 2, 7, '{}', 1487750601, 1487750663, '2017-02-22', 1, 1487750598, 4270.00), (581, 182, 1, 7, '{}', 1487750694, 1488203412, '2017-02-22', 1, 1487750692, 4270.00), (582, 185, 3, 7, '{}', 1487774051, 1487774051, '2017-02-22', 0, 1487774043, 8913.00), (583, 184, 3, 7, '{}', 1487774071, 1487774235, '2017-02-22', 0, 1487774093, 3285.00), (584, 184, 2, 8, '{}', 1487774074, 1487774074, '2017-02-22', 0, 1487774073, 3285.00), (585, 184, 1, 8, '{}', 1487774081, 1487774081, '2017-02-22', 0, 1487774075, 3285.00), (586, 193, 2, 8, '{}', 1487955294, 1487955318, '2017-02-24', 0, 1487955311, 4270.00), (587, 193, 1, 8, '{}', 1487955324, 1487955324, '2017-02-24', 0, 1487955320, 4270.00), (588, 193, 3, 7, '{}', 1487955341, 1487955341, '2017-02-24', 0, 1487955325, 4270.00), (589, 186, 1, 8, '{}', 1487957291, 1487957464, '2017-02-24', 0, 1487957459, 6960.00), (590, 186, 2, 8, '{}', 1487957308, 1487957468, '2017-02-24', 0, 1487957465, 6960.00), (591, 186, 3, 7, '{}', 1487957312, 1487957473, '2017-02-24', 0, 1487957469, 6960.00), (592, 194, 1, 8, '{}', 1488193293, 1488203412, '2017-02-27', 1, 1488193280, 2320.00), (593, 194, 2, 8, '{}', 1488193304, 1488193304, '2017-02-27', 1, 1488193303, 2320.00), (594, 210, 1, 9, '{}', 1488198896, 1488198896, '2017-02-27', 0, 1488198885, 4270.00), (595, 210, 2, 12, '{}', 1488198901, 1488198901, '2017-02-27', 1, 1488532585, 4270.00), (596, 210, 3, 10, '{}', 1488198904, 1488198904, '2017-02-27', 1, 1488532565, 4270.00), (597, 209, 2, 9, '{}', 1488200016, 1488450772, '2017-02-27', 1, 1488450449, 4270.00), (598, 209, 1, 9, '{}', 1488200020, 1488200063, '2017-02-27', 1, 1488200017, 4271.00), (599, 209, 3, 7, '{}', 1488200053, 1488200053, '2017-02-27', 0, 1488200021, 4271.00), (600, 211, 2, 10, '{}', 1488216265, 1489402027, '2017-02-27', 1, 1488216264, 2320.00), (601, 211, 3, 7, '{}', 1488216281, 1488216281, '2017-02-27', 1, 1488216276, 2320.00), (602, 211, 1, 10, '{}', 1488216283, 1488216283, '2017-02-27', 1, 1488216282, 2320.00), (603, 198, 2, 11, '{}', 1488280125, 1488280125, '2017-02-28', 0, 1488280095, 4270.00), (604, 198, 1, 11, '{}', 1488280160, 1488280160, '2017-02-28', 0, 1488280126, 4270.00), (605, 198, 3, 8, '{}', 1488280440, 1488280440, '2017-02-28', 0, 1488280435, 4270.00), (606, 212, 1, 12, '{}', 1488286301, 1489402168, '2017-02-28', 1, 1488286295, 13825.00), (607, 212, 3, 8, '{}', 1488289644, 1488289690, '2017-02-28', 1, 1488289642, 25295.00), (608, 212, 2, 13, '{}', 1488290350, 1488290431, '2017-02-28', 1, 1488290347, 13133.75), (609, 213, 1, 11, '{}', 1488529470, 1488529470, '2017-03-03', 1, 1488529461, 5660.00), (610, 213, 2, 11, '{}', 1488529484, 1488529484, '2017-03-03', 1, 1488529479, 5660.00), (611, 213, 3, 9, '{}', 1488529493, 1488529493, '2017-03-03', 1, 1488529489, 5660.00), (612, 197, 2, 13, '{}', 1489400715, 1489400715, '2017-03-13', 0, 1489398959, 4270.00), (613, 219, 3, 11, '{}', 1490084337, 1490181958, '2017-03-21', 1, 1490084334, 73526.00), (614, 216, 3, 11, '{}', 1490085757, 1490086717, '2017-03-21', 0, 1490085755, 5377.00); SELECT * FROM (SELECT @row := @row + 1 as row, a.* from ( SELECT t.order_number FROM sales_documents t WHERE t.type = 2 AND t.date >= '2017-01-01' AND t.date <= '2017-12-31' AND t.order_number IS NOT NULL AND t.generated = 1 GROUP BY t.order_number ) a, (SELECT @row := 0) r) t WHERE row <> order_number; row order_number 14 51 DROP TABLE sales_documents; # # MDEV-12845: pushdown from merged derived using equalities # create table t1 (a int); insert into t1 values (4), (8), (5), (3), (10), (2), (7); create table t2 (b int, c int); insert into t2 values (2,1), (5,2), (2,2), (4,1), (4,3), (5,3), (2,4), (4,6), (2,1); create view v1 as select b, sum(c) as s from t2 group by b; create view v2 as select distinct b, c from t2; create view v3 as select b, max(c) as m from t2 group by b; select b from ( select t1.a, v1.b, v1.s from t1, v1 where t1.a = v1.b ) as t where b > 2; b 4 5 explain format=json select b from ( select t1.a, v1.b, v1.s from t1, v1 where t1.a = v1.b ) as t where b > 2; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t1", "access_type": "ALL", "rows": 7, "filtered": 100, "attached_condition": "t1.a > 2 and t1.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["b"], "ref": ["test.t1.a"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 3, "filesort": { "sort_key": "t2.b", "temporary_table": { "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.b > 2" } } } } } } } } select a from ( select t1.a, v1.b, v1.s from t1, v1 where t1.a = v1.b ) as t where a > 2; a 4 5 explain format=json select a from ( select t1.a, v1.b, v1.s from t1, v1 where t1.a = v1.b ) as t where a > 2; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t1", "access_type": "ALL", "rows": 7, "filtered": 100, "attached_condition": "t1.a > 2 and t1.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["b"], "ref": ["test.t1.a"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 3, "filesort": { "sort_key": "t2.b", "temporary_table": { "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.b > 2" } } } } } } } } select a from ( select t1.a, v2.b, v2.c from t1, v2 where t1.a = v2.b ) as t where a > 2; a 4 4 4 5 5 explain format=json select a from ( select t1.a, v2.b, v2.c from t1, v2 where t1.a = v2.b ) as t where a > 2; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t1", "access_type": "ALL", "rows": 7, "filtered": 100, "attached_condition": "t1.a > 2 and t1.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["b"], "ref": ["test.t1.a"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 3, "temporary_table": { "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100, "attached_condition": "t2.b > 2" } } } } } } } select a from ( select t1.a, v3.b, v3.m from t1, v3 where t1.a = v3.m ) as t where a > 2; a 4 3 explain format=json select a from ( select t1.a, v3.b, v3.m from t1, v3 where t1.a = v3.m ) as t where a > 2; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t1", "access_type": "ALL", "rows": 7, "filtered": 100, "attached_condition": "t1.a > 2 and t1.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "5", "used_key_parts": ["m"], "ref": ["test.t1.a"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 3, "having_condition": "m > 2", "filesort": { "sort_key": "t2.b", "temporary_table": { "table": { "table_name": "t2", "access_type": "ALL", "rows": 9, "filtered": 100 } } } } } } } } drop view v1,v2,v3; drop table t1,t2; # # MDEV-13166: pushdown from merged derived # CREATE TABLE t1 (i int) ENGINE=MyISAM; INSERT INTO t1 VALUES (1),(2); CREATE VIEW v1 AS SELECT MAX(i) AS f FROM t1; SELECT * FROM ( SELECT * FROM v1 ) AS sq WHERE f > 0; f 2 explain format=json SELECT * FROM ( SELECT * FROM v1 ) AS sq WHERE f > 0; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "v1.f > 0", "materialized": { "query_block": { "select_id": 3, "having_condition": "f > 0", "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100 } } } } } } DROP VIEW v1; DROP TABLE t1; # # MDEV-13193: pushdown of equality extracted from multiple equality # CREATE TABLE t1 (i1 int, KEY(i1)) ENGINE=MyISAM; INSERT INTO t1 VALUES (1),(2); CREATE TABLE t2 (i2 int) ENGINE=MyISAM; INSERT INTO t2 VALUES (2),(4); CREATE ALGORITHM=TEMPTABLE VIEW v2 AS SELECT * FROM t2; SELECT * FROM t1, ( SELECT * FROM v2 ) AS sq WHERE i1 = 1 AND ( i1 = i2 OR i1 = 2 ); i1 i2 explain format=json SELECT * FROM t1, ( SELECT * FROM v2 ) AS sq WHERE i1 = 1 AND ( i1 = i2 OR i1 = 2 ); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t1", "access_type": "ref", "possible_keys": ["i1"], "key": "i1", "key_length": "5", "used_key_parts": ["i1"], "ref": ["const"], "rows": 1, "filtered": 100, "using_index": true }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "v2.i2 = 1" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "materialized": { "query_block": { "select_id": 3, "table": { "table_name": "t2", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "t2.i2 = 1" } } } } } } DROP VIEW v2; DROP TABLE t1,t2; # # MDEV-14237: derived with regexp_substr() in select list # create table t1 (a char(8)); insert into t1 values ('b'), ('a'), ('xx'); select * from ( select distinct regexp_substr(t1.a,'^[A-Za-z]+') as f from t1) as t where t.f = 'a' or t.f = 'b'; f b a explain format=json select * from ( select distinct regexp_substr(t1.a,'^[A-Za-z]+') as f from t1) as t where t.f = 'a' or t.f = 'b'; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "t.f = 'a' or t.f = 'b'", "materialized": { "query_block": { "select_id": 2, "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 3, "filtered": 100 } } } } } } } drop table t1; # # MDEV-13454: consequence of mdev-14368 fixed for 5.5 # SET sql_mode = 'ONLY_FULL_GROUP_BY'; create table t1 (id int, id2 int); insert into t1 values (1,1),(2,3),(3,4),(7,2); create table t2(id2 int); insert t2 values (1),(2),(3); SELECT * FROM t1 LEFT OUTER JOIN (SELECT id2, COUNT(*) as ct FROM t2 GROUP BY id2) vc USING (id2) WHERE (vc.ct>0); id2 id ct 1 1 1 3 2 1 2 7 1 EXPLAIN FORMAT=JSON SELECT * FROM t1 LEFT OUTER JOIN (SELECT id2, COUNT(*) as ct FROM t2 GROUP BY id2) vc USING (id2) WHERE (vc.ct>0); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "vc.ct > 0", "materialized": { "query_block": { "select_id": 2, "having_condition": "ct > 0", "filesort": { "sort_key": "t2.id2", "temporary_table": { "table": { "table_name": "t2", "access_type": "ALL", "rows": 3, "filtered": 100 } } } } } }, "block-nl-join": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 4, "filtered": 100 }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "t1.id2 = vc.id2" } } } DROP TABLE t1,t2; SET sql_mode = DEFAULT; # # MDEV-15579: incorrect removal of sub-formulas to be pushed # into WHERE of materialized derived with GROUP BY # CREATE TABLE t1 (a INT, b INT, c INT, d INT); CREATE TABLE t2 (x INT, y INT, z INT); INSERT INTO t1 VALUES (1,1,66,1), (1,1,56,2), (3,2,42,3); INSERT INTO t2 VALUES (1,1,66), (1,12,32); SELECT * FROM t2, ( SELECT a, b, max(c) AS max_c FROM t1 GROUP BY a HAVING max_c > 37 ) AS v1 WHERE (v1.a=1) AND (v1.b=v1.a) AND (v1.a=t2.x) AND (v1.max_c>30); x y z a b max_c 1 1 66 1 1 66 1 12 32 1 1 66 EXPLAIN SELECT * FROM t2, ( SELECT a, b, max(c) AS max_c FROM t1 GROUP BY a HAVING max_c > 37 ) AS v1 WHERE (v1.a=1) AND (v1.b=v1.a) AND (v1.a=t2.x) AND (v1.max_c>30); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where 1 PRIMARY ALL NULL NULL NULL NULL 3 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 3 Using where EXPLAIN FORMAT=JSON SELECT * FROM t2, ( SELECT a, b, max(c) AS max_c FROM t1 GROUP BY a HAVING max_c > 37 ) AS v1 WHERE (v1.a=1) AND (v1.b=v1.a) AND (v1.a=t2.x) AND (v1.max_c>30); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "t2.x = 1" }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "v1.a = 1 and v1.b = 1 and v1.max_c > 30" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c > 37 and max_c > 30 and t1.b = 1", "table": { "table_name": "t1", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "t1.a = 1" } } } } } } SELECT * FROM t2, ( SELECT a, b, d, max(c) AS max_c FROM t1 GROUP BY a,d HAVING max_c > 37 ) AS v1 WHERE (v1.a=1) AND (v1.b=v1.a) AND (v1.b=v1.d) AND (v1.a=t2.x) AND (v1.max_c>30); x y z a b d max_c 1 1 66 1 1 1 66 1 12 32 1 1 1 66 EXPLAIN SELECT * FROM t2, ( SELECT a, b, d, max(c) AS max_c FROM t1 GROUP BY a,d HAVING max_c > 37 ) AS v1 WHERE (v1.a=1) AND (v1.b=v1.a) AND (v1.b=v1.d) AND (v1.a=t2.x) AND (v1.max_c>30); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where 1 PRIMARY ALL NULL NULL NULL NULL 3 Using where; Using join buffer (flat, BNL join) 2 DERIVED t1 ALL NULL NULL NULL NULL 3 Using where EXPLAIN FORMAT=JSON SELECT * FROM t2, ( SELECT a, b, d, max(c) AS max_c FROM t1 GROUP BY a,d HAVING max_c > 37 ) AS v1 WHERE (v1.a=1) AND (v1.b=v1.a) AND (v1.b=v1.d) AND (v1.a=t2.x) AND (v1.max_c>30); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "t2.x = 1" }, "block-nl-join": { "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "v1.a = 1 and v1.b = 1 and v1.d = 1 and v1.max_c > 30" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "materialized": { "query_block": { "select_id": 2, "having_condition": "max_c > 37 and max_c > 30 and t1.b = 1", "table": { "table_name": "t1", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "t1.a = 1 and t1.d = 1" } } } } } } DROP TABLE t1,t2; # # MDEV-15765: pushing condition with temporal constants # into constant tables # select * from (select date('2018-01-01') as d union all select date('2018-01-01') as d) as t where t.d between date ('2017-01-01') and date ('2019-01-01'); d 2018-01-01 2018-01-01 select * from (select date('2018-01-01') as d) as t where t.d between date ('2017-01-01') and date ('2019-01-01'); d 2018-01-01 # # MDEV-16088: pushdown into derived defined in the IN subquery # CREATE TABLE t1 (a INT, b INT); CREATE TABLE t2 (e INT, f INT, g INT); INSERT INTO t1 VALUES (1,14),(2,13),(1,19),(2,32),(3,24); INSERT INTO t2 VALUES (1,19,2),(3,24,1),(1,12,2),(3,11,3),(2,32,1); SELECT * FROM t1 WHERE (t1.a,t1.b) IN ( SELECT d_tab.e,d_tab.max_f FROM ( SELECT t2.e, MAX(t2.f) AS max_f FROM t2 GROUP BY t2.e HAVING max_f>18 ) as d_tab WHERE d_tab.e>1 ) ; a b 2 32 3 24 EXPLAIN SELECT * FROM t1 WHERE (t1.a,t1.b) IN ( SELECT d_tab.e,d_tab.max_f FROM ( SELECT t2.e, MAX(t2.f) AS max_f FROM t2 GROUP BY t2.e HAVING max_f>18 ) as d_tab WHERE d_tab.e>1 ) ; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 5 1 PRIMARY eq_ref distinct_key distinct_key 8 func,func 1 2 MATERIALIZED ALL NULL NULL NULL NULL 5 Using where 3 DERIVED t2 ALL NULL NULL NULL NULL 5 Using where; Using temporary; Using filesort EXPLAIN FORMAT=JSON SELECT * FROM t1 WHERE (t1.a,t1.b) IN ( SELECT d_tab.e,d_tab.max_f FROM ( SELECT t2.e, MAX(t2.f) AS max_f FROM t2 GROUP BY t2.e HAVING max_f>18 ) as d_tab WHERE d_tab.e>1 ) ; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t1", "access_type": "ALL", "rows": 5, "filtered": 100 }, "table": { "table_name": "", "access_type": "eq_ref", "possible_keys": ["distinct_key"], "key": "distinct_key", "key_length": "8", "used_key_parts": ["e", "max_f"], "ref": ["func", "func"], "rows": 1, "filtered": 100, "materialized": { "unique": 1, "query_block": { "select_id": 2, "table": { "table_name": "", "access_type": "ALL", "rows": 5, "filtered": 100, "attached_condition": "d_tab.e > 1", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_f > 18", "filesort": { "sort_key": "t2.e", "temporary_table": { "table": { "table_name": "t2", "access_type": "ALL", "rows": 5, "filtered": 100, "attached_condition": "t2.e > 1" } } } } } } } } } } } SELECT * FROM t1 WHERE (t1.a,t1.b) IN ( SELECT d_tab.e,d_tab.max_f FROM ( SELECT t2.e, MAX(t2.f) AS max_f FROM t2 GROUP BY t2.e HAVING max_f>18 ) as d_tab WHERE d_tab.max_f<25 ) ; a b 1 19 3 24 EXPLAIN SELECT * FROM t1 WHERE (t1.a,t1.b) IN ( SELECT d_tab.e,d_tab.max_f FROM ( SELECT t2.e, MAX(t2.f) AS max_f FROM t2 GROUP BY t2.e HAVING max_f>18 ) as d_tab WHERE d_tab.max_f<25 ) ; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 5 1 PRIMARY eq_ref distinct_key distinct_key 8 func,func 1 2 MATERIALIZED ALL NULL NULL NULL NULL 5 Using where 3 DERIVED t2 ALL NULL NULL NULL NULL 5 Using temporary; Using filesort EXPLAIN FORMAT=JSON SELECT * FROM t1 WHERE (t1.a,t1.b) IN ( SELECT d_tab.e,d_tab.max_f FROM ( SELECT t2.e, MAX(t2.f) AS max_f FROM t2 GROUP BY t2.e HAVING max_f>18 ) as d_tab WHERE d_tab.max_f<25 ) ; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t1", "access_type": "ALL", "rows": 5, "filtered": 100 }, "table": { "table_name": "", "access_type": "eq_ref", "possible_keys": ["distinct_key"], "key": "distinct_key", "key_length": "8", "used_key_parts": ["e", "max_f"], "ref": ["func", "func"], "rows": 1, "filtered": 100, "materialized": { "unique": 1, "query_block": { "select_id": 2, "table": { "table_name": "", "access_type": "ALL", "rows": 5, "filtered": 100, "attached_condition": "d_tab.max_f < 25", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_f > 18 and max_f < 25", "filesort": { "sort_key": "t2.e", "temporary_table": { "table": { "table_name": "t2", "access_type": "ALL", "rows": 5, "filtered": 100 } } } } } } } } } } } SELECT * FROM t1 WHERE (t1.a,t1.b) IN ( SELECT d_tab.e, MAX(d_tab.max_f) AS max_f FROM ( SELECT t2.e, MAX(t2.f) as max_f, t2.g FROM t2 GROUP BY t2.e ) as d_tab WHERE d_tab.e>1 GROUP BY d_tab.g ) ; a b 2 32 EXPLAIN SELECT * FROM t1 WHERE (t1.a,t1.b) IN ( SELECT d_tab.e, MAX(d_tab.max_f) AS max_f FROM ( SELECT t2.e, MAX(t2.f) as max_f, t2.g FROM t2 GROUP BY t2.e ) as d_tab WHERE d_tab.e>1 GROUP BY d_tab.g ) ; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 5 Using where 1 PRIMARY eq_ref distinct_key distinct_key 8 test.t1.a,test.t1.b 1 2 MATERIALIZED ALL NULL NULL NULL NULL 5 Using where; Using temporary 3 DERIVED t2 ALL NULL NULL NULL NULL 5 Using where; Using temporary; Using filesort EXPLAIN FORMAT=JSON SELECT * FROM t1 WHERE (t1.a,t1.b) IN ( SELECT d_tab.e, MAX(d_tab.max_f) AS max_f FROM ( SELECT t2.e, MAX(t2.f) as max_f, t2.g FROM t2 GROUP BY t2.e ) as d_tab WHERE d_tab.e>1 GROUP BY d_tab.g ) ; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t1", "access_type": "ALL", "rows": 5, "filtered": 100, "attached_condition": "t1.a is not null and t1.b is not null" }, "table": { "table_name": "", "access_type": "eq_ref", "possible_keys": ["distinct_key"], "key": "distinct_key", "key_length": "8", "used_key_parts": ["e", "max_f"], "ref": ["test.t1.a", "test.t1.b"], "rows": 1, "filtered": 100, "materialized": { "unique": 1, "query_block": { "select_id": 2, "temporary_table": { "table": { "table_name": "", "access_type": "ALL", "rows": 5, "filtered": 100, "attached_condition": "d_tab.e > 1", "materialized": { "query_block": { "select_id": 3, "filesort": { "sort_key": "t2.e", "temporary_table": { "table": { "table_name": "t2", "access_type": "ALL", "rows": 5, "filtered": 100, "attached_condition": "t2.e > 1" } } } } } } } } } } } } SELECT * FROM t1 WHERE (t1.a,t1.b) IN ( SELECT d_tab.e, MAX(d_tab.max_f) AS max_f FROM ( SELECT t2.e, MAX(t2.f) as max_f, t2.g FROM t2 GROUP BY t2.e ) as d_tab WHERE d_tab.max_f>20 GROUP BY d_tab.g ) ; a b 2 32 EXPLAIN SELECT * FROM t1 WHERE (t1.a,t1.b) IN ( SELECT d_tab.e, MAX(d_tab.max_f) AS max_f FROM ( SELECT t2.e, MAX(t2.f) as max_f, t2.g FROM t2 GROUP BY t2.e ) as d_tab WHERE d_tab.max_f>20 GROUP BY d_tab.g ) ; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 ALL NULL NULL NULL NULL 5 Using where 1 PRIMARY eq_ref distinct_key distinct_key 8 test.t1.a,test.t1.b 1 2 MATERIALIZED ALL NULL NULL NULL NULL 5 Using where; Using temporary 3 DERIVED t2 ALL NULL NULL NULL NULL 5 Using temporary; Using filesort EXPLAIN FORMAT=JSON SELECT * FROM t1 WHERE (t1.a,t1.b) IN ( SELECT d_tab.e, MAX(d_tab.max_f) AS max_f FROM ( SELECT t2.e, MAX(t2.f) as max_f, t2.g FROM t2 GROUP BY t2.e ) as d_tab WHERE d_tab.max_f>20 GROUP BY d_tab.g ) ; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t1", "access_type": "ALL", "rows": 5, "filtered": 100, "attached_condition": "t1.a is not null and t1.b is not null" }, "table": { "table_name": "", "access_type": "eq_ref", "possible_keys": ["distinct_key"], "key": "distinct_key", "key_length": "8", "used_key_parts": ["e", "max_f"], "ref": ["test.t1.a", "test.t1.b"], "rows": 1, "filtered": 100, "materialized": { "unique": 1, "query_block": { "select_id": 2, "temporary_table": { "table": { "table_name": "", "access_type": "ALL", "rows": 5, "filtered": 100, "attached_condition": "d_tab.max_f > 20", "materialized": { "query_block": { "select_id": 3, "having_condition": "max_f > 20", "filesort": { "sort_key": "t2.e", "temporary_table": { "table": { "table_name": "t2", "access_type": "ALL", "rows": 5, "filtered": 100 } } } } } } } } } } } } DROP TABLE t1,t2; # # MDEV-15765: pushing condition with IN subquery defined with constants # using substitution # CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1),(2); SELECT * FROM ( SELECT DISTINCT * FROM t1 ) der_tab WHERE (a>0 AND a<2 OR a IN (2,3)) AND (a=2 OR 0); a 2 DROP TABLE t1; # # MDEV-16386: pushing condition into the HAVING clause when ambiguous # fields warning appears # CREATE TABLE t1 (a INT, b INT); INSERT INTO t1 VALUES (1,2),(2,3),(3,4); SELECT * FROM ( SELECT t1.b AS a FROM t1 GROUP BY t1.a ) dt WHERE (dt.a=2); a 2 EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT t1.b AS a FROM t1 GROUP BY t1.a ) dt WHERE (dt.a=2); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "dt.a = 2", "materialized": { "query_block": { "select_id": 2, "having_condition": "a = 2", "filesort": { "sort_key": "t1.a", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 3, "filtered": 100 } } } } } } } } SELECT * FROM ( SELECT t1.b AS a FROM t1 GROUP BY t1.a HAVING (t1.a<3) ) dt WHERE (dt.a>1); a 2 3 EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT t1.b AS a FROM t1 GROUP BY t1.a HAVING (t1.a<3) ) dt WHERE (dt.a>1); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "dt.a > 1", "materialized": { "query_block": { "select_id": 2, "having_condition": "t1.a < 3 and a > 1", "filesort": { "sort_key": "t1.a", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 3, "filtered": 100 } } } } } } } } SELECT * FROM ( SELECT 'ab' AS a FROM t1 GROUP BY t1.a ) dt WHERE (dt.a='ab'); a ab ab ab EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT 'ab' AS a FROM t1 GROUP BY t1.a ) dt WHERE (dt.a='ab'); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "dt.a = 'ab'", "materialized": { "query_block": { "select_id": 2, "filesort": { "sort_key": "t1.a", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 3, "filtered": 100 } } } } } } } } SELECT * FROM ( SELECT 1 AS a FROM t1 GROUP BY t1.a ) dt WHERE (dt.a=1); a 1 1 1 EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT 1 AS a FROM t1 GROUP BY t1.a ) dt WHERE (dt.a=1); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "dt.a = 1", "materialized": { "query_block": { "select_id": 2, "filesort": { "sort_key": "t1.a", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 3, "filtered": 100 } } } } } } } } DROP TABLE t1; # # MDEV-16517: pushdown condition with the IN predicate defined # with non-constant values # CREATE TABLE t1 (a INT, b INT); INSERT INTO t1 VALUES (1,2),(1,3); SELECT * FROM ( SELECT t1.a FROM t1 WHERE 1 IN (0,t1.a) GROUP BY t1.a ) AS dt1 JOIN ( SELECT t1.a FROM t1 WHERE 1 IN (0,t1.a) ) AS dt2 ON dt1.a = dt2.a; a a 1 1 1 1 EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT t1.a FROM t1 WHERE 1 IN (0,t1.a) GROUP BY t1.a ) AS dt1 JOIN ( SELECT t1.a FROM t1 WHERE 1 IN (0,t1.a) ) AS dt2 ON dt1.a = dt2.a; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "1 in (0,dt1.a)", "materialized": { "query_block": { "select_id": 2, "filesort": { "sort_key": "t1.a", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "1 in (0,t1.a) and 1 in (0,t1.a)" } } } } } }, "block-nl-join": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100 }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "t1.a = dt1.a" } } } SELECT * FROM ( SELECT t1.a,MAX(t1.b) FROM t1 GROUP BY t1.a ) AS dt, t1 WHERE dt.a=t1.a AND dt.a IN (1,t1.a); a MAX(t1.b) a b 1 3 1 2 1 3 1 3 EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT t1.a,MAX(t1.b) FROM t1 GROUP BY t1.a ) AS dt, t1 WHERE dt.a=t1.a AND dt.a IN (1,t1.a); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "dt.a in (1,dt.a)", "materialized": { "query_block": { "select_id": 2, "filesort": { "sort_key": "t1.a", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "t1.a in (1,t1.a)" } } } } } }, "block-nl-join": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100 }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "t1.a = dt.a" } } } DROP TABLE t1; # # MDEV-15087: error from inexpensive subquery before check # for condition pushdown into derived # CREATE TABLE t1 (i1 int, v1 varchar(1)); INSERT INTO t1 VALUES (7,'x'); CREATE TABLE t2 (i1 int); INSERT INTO t2 VALUES (8); CREATE TABLE t3 (i1 int ,v1 varchar(1), v2 varchar(1)); INSERT INTO t3 VALUES (4, 'v','v'),(62,'v','k'),(7, 'n', NULL); SELECT 1 FROM (t1 AS a1 JOIN (((SELECT DISTINCT t3.* FROM t3) AS a2 JOIN t1 ON (t1.v1 = a2.v2))) ON (t1.v1 = a2.v1)) WHERE (SELECT BIT_COUNT(t2.i1) FROM (t2 JOIN t3)) IS NULL; ERROR 21000: Subquery returns more than 1 row DROP TABLE t1, t2, t3; # # MDEV-16614 signal 7 after calling stored procedure, that uses regexp # CREATE PROCEDURE p1(m1 varchar(5), m2 varchar(5)) BEGIN SELECT a FROM (SELECT "aa" a) t JOIN (SELECT "aa" b) t1 on t.a=t1.b WHERE t.a regexp m1 and t1.b regexp m2 GROUP BY a; END$$ CALL p1('a','a'); a aa DROP PROCEDURE p1; CREATE PROCEDURE p1(m1 varchar(5)) BEGIN SELECT a FROM (SELECT "aa" a) t WHERE t.a regexp m1; END$$ CALL p1('a'); a aa DROP PROCEDURE p1; SELECT a FROM (SELECT "aa" a) t WHERE REGEXP_INSTR(t.a, (SELECT MAX('aa') FROM DUAL LIMIT 1)); a aa CREATE OR REPLACE FUNCTION f1(a VARCHAR(10), b VARCHAR(10)) RETURNS INT BEGIN RETURN 1; END;$$ CREATE OR REPLACE PROCEDURE p1(m1 varchar(5)) BEGIN SELECT a FROM (SELECT "aa" a) t WHERE f1(t.a, m1); END$$ CALL p1('a'); a aa DROP PROCEDURE p1; DROP FUNCTION f1; CREATE OR REPLACE FUNCTION f1(a VARCHAR(10), b VARCHAR(10)) RETURNS INT BEGIN RETURN 1; END;$$ SELECT a FROM (SELECT "aa" a) t WHERE f1(t.a, (SELECT MAX('aa') FROM DUAL LIMIT 1)); a aa DROP FUNCTION f1; # # MDEV-17011: condition pushdown into materialized derived used # in INSERT SELECT, multi-table UPDATE and DELETE # CREATE TABLE t1 (a int ,b int) ENGINE=MyISAM; INSERT INTO t1 VALUES (1, 1), (1, 2), (2, 1), (2, 2), (3,1), (3,3), (4,2); CREATE TABLE t2 (a int) ENGINE MYISAM; INSERT INTO t2 VALUES (3), (7), (1), (4), (1); CREATE TABLE t3 (a int, b int) ENGINE MYISAM; EXPLAIN FORMAT=JSON INSERT INTO t3 SELECT * FROM (SELECT a, count(*) as c FROM t1 GROUP BY a) t WHERE a<=2; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 7, "filtered": 100, "attached_condition": "t.a <= 2", "materialized": { "query_block": { "select_id": 2, "filesort": { "sort_key": "t1.a", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 7, "filtered": 100, "attached_condition": "t1.a <= 2" } } } } } } } } INSERT INTO t3 SELECT * FROM (SELECT a, count(*) as c FROM t1 GROUP BY a) t WHERE a<=2; SELECT * FROM t3; a b 1 2 2 2 EXPLAIN FORMAT=JSON UPDATE t2, (SELECT a, count(*) as c FROM t1 GROUP BY a) t SET t2.a=t.c+10 WHERE t2.a= t.c and t.a>=3; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 5, "filtered": 100, "attached_condition": "t2.a is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "8", "used_key_parts": ["c"], "ref": ["test.t2.a"], "rows": 2, "filtered": 100, "attached_condition": "t2.a = t.c and t.a >= 3", "materialized": { "query_block": { "select_id": 2, "filesort": { "sort_key": "t1.a", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 7, "filtered": 100, "attached_condition": "t1.a >= 3" } } } } } } } } UPDATE t2, (SELECT a, count(*) as c FROM t1 GROUP BY a) t SET t2.a=t.c+10 WHERE t2.a= t.c and t.a>=3; SELECT * FROM t2; a 3 7 11 4 11 EXPLAIN FORMAT=JSON DELETE t2 FROM t2, (SELECT a, count(*) as c FROM t1 GROUP BY a) t WHERE t2.a= t.c+9 and t.a=2; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "ALL", "rows": 5, "filtered": 100 }, "table": { "table_name": "", "access_type": "ALL", "rows": 7, "filtered": 100, "attached_condition": "t.a = 2 and t2.a = t.c + 9", "materialized": { "query_block": { "select_id": 2, "table": { "table_name": "t1", "access_type": "ALL", "rows": 7, "filtered": 100, "attached_condition": "t1.a = 2" } } } } } } DELETE t2 FROM t2, (SELECT a, count(*) as c FROM t1 GROUP BY a) t WHERE t2.a= t.c+9 and t.a=2; SELECT * FROM t2; a 3 7 4 DROP TABLE t1,t2,t3; # # MDEV-16765: pushdown condition with the CASE structure # defined with Item_cond item # CREATE TABLE t1(a INT, b INT); INSERT INTO t1 VALUES (1,2), (3,4), (2,3); SELECT * FROM ( SELECT CASE WHEN ((tab2.max_a=1) OR (tab2.max_a=2)) THEN 1 ELSE 0 END AS max_a,b FROM (SELECT MAX(a) as max_a,b FROM t1 GROUP BY t1.b) AS tab2 ) AS tab1 WHERE (tab1.max_a=1); max_a b 1 2 1 3 EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT CASE WHEN ((tab2.max_a=1) OR (tab2.max_a=2)) THEN 1 ELSE 0 END AS max_a,b FROM (SELECT MAX(a) as max_a,b FROM t1 GROUP BY t1.b) AS tab2 ) AS tab1 WHERE (tab1.max_a=1); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "case when (tab2.max_a = 1 or tab2.max_a = 2) then 1 else 0 end = 1", "materialized": { "query_block": { "select_id": 3, "having_condition": "case when (max_a = 1 or max_a = 2) then 1 else 0 end = 1", "filesort": { "sort_key": "t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 3, "filtered": 100 } } } } } } } } SELECT * FROM ( SELECT CASE WHEN ((tab2.max_a=1) OR ((tab2.max_a>2) AND (tab2.max_a<4))) THEN 1 ELSE 0 END AS max_a,b FROM (SELECT MAX(a) as max_a,b FROM t1 GROUP BY t1.b) AS tab2 ) AS tab1 WHERE (tab1.max_a=1); max_a b 1 2 1 4 EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT CASE WHEN ((tab2.max_a=1) OR ((tab2.max_a>2) AND (tab2.max_a<4))) THEN 1 ELSE 0 END AS max_a,b FROM (SELECT MAX(a) as max_a,b FROM t1 GROUP BY t1.b) AS tab2 ) AS tab1 WHERE (tab1.max_a=1); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "case when (tab2.max_a = 1 or tab2.max_a > 2 and tab2.max_a < 4) then 1 else 0 end = 1", "materialized": { "query_block": { "select_id": 3, "having_condition": "case when (max_a = 1 or max_a > 2 and max_a < 4) then 1 else 0 end = 1", "filesort": { "sort_key": "t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 3, "filtered": 100 } } } } } } } } SELECT * FROM ( SELECT CASE WHEN ((tab2.max_a>1) AND ((tab2.max_a=2) OR (tab2.max_a>2))) THEN 1 ELSE 0 END AS max_a,b FROM (SELECT MAX(a) as max_a,b FROM t1 GROUP BY t1.b) AS tab2 ) AS tab1 WHERE (tab1.max_a=1); max_a b 1 3 1 4 EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT CASE WHEN ((tab2.max_a>1) AND ((tab2.max_a=2) OR (tab2.max_a>2))) THEN 1 ELSE 0 END AS max_a,b FROM (SELECT MAX(a) as max_a,b FROM t1 GROUP BY t1.b) AS tab2 ) AS tab1 WHERE (tab1.max_a=1); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "case when (tab2.max_a > 1 and (tab2.max_a = 2 or tab2.max_a > 2)) then 1 else 0 end = 1", "materialized": { "query_block": { "select_id": 3, "having_condition": "case when (max_a > 1 and (max_a = 2 or max_a > 2)) then 1 else 0 end = 1", "filesort": { "sort_key": "t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 3, "filtered": 100 } } } } } } } } SELECT * FROM ( SELECT CASE WHEN ((tab2.b=2) OR (tab2.b=4)) THEN 1 ELSE 0 END AS max_a,b FROM (SELECT MAX(a) as max_a,b FROM t1 GROUP BY t1.b) AS tab2 ) AS tab1 WHERE (tab1.max_a=1); max_a b 1 2 1 4 EXPLAIN FORMAT=JSON SELECT * FROM ( SELECT CASE WHEN ((tab2.b=2) OR (tab2.b=4)) THEN 1 ELSE 0 END AS max_a,b FROM (SELECT MAX(a) as max_a,b FROM t1 GROUP BY t1.b) AS tab2 ) AS tab1 WHERE (tab1.max_a=1); EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "case when (tab2.b = 2 or tab2.b = 4) then 1 else 0 end = 1", "materialized": { "query_block": { "select_id": 3, "filesort": { "sort_key": "t1.b", "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 3, "filtered": 100, "attached_condition": "case when (t1.b = 2 or t1.b = 4) then 1 else 0 end = 1" } } } } } } } } DROP TABLE t1; # # MDEV-16803: pushdown condition with IN predicate in the derived table # defined with several SELECT statements # CREATE TABLE t1 (a INT, b INT); INSERT INTO t1 VALUES (1,2),(3,2),(1,1); SELECT * FROM ( SELECT a,b,1 as c FROM t1 UNION ALL SELECT a,b,2 as c FROM t1 ) AS tab WHERE ((a,b) IN ((1,2),(3,2))); a b c 1 2 1 3 2 1 1 2 2 3 2 2 DROP TABLE t1; # # MDEV-17354: INSERT SELECT with condition pushdown into derived # CREATE TABLE t1 (f INT NOT NULL); INSERT INTO t1 VALUES (3), (7), (3); CREATE ALGORITHM= TEMPTABLE VIEW v1 AS SELECT * FROM ( SELECT * FROM t1 ) AS sq; INSERT INTO t1 SELECT * FROM ( SELECT t1.f FROM v1 JOIN t1 ) AS t WHERE f IS NOT NULL; EXPLAIN INSERT INTO t1 SELECT * FROM ( SELECT t1.f FROM v1 JOIN t1 ) AS t WHERE f IS NOT NULL; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY ALL NULL NULL NULL NULL 144 Using where 2 DERIVED ALL NULL NULL NULL NULL 12 2 DERIVED t1 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join) 3 DERIVED t1 ALL NULL NULL NULL NULL 12 EXPLAIN FORMAT=JSON INSERT INTO t1 SELECT * FROM ( SELECT t1.f FROM v1 JOIN t1 ) AS t WHERE f IS NOT NULL; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 144, "filtered": 100, "attached_condition": "t.f is not null", "materialized": { "query_block": { "select_id": 2, "table": { "table_name": "", "access_type": "ALL", "rows": 12, "filtered": 100, "materialized": { "query_block": { "select_id": 3, "table": { "table_name": "t1", "access_type": "ALL", "rows": 12, "filtered": 100 } } } }, "block-nl-join": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 12, "filtered": 100, "attached_condition": "t1.f is not null" }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL" } } } } } } SELECT * FROM t1; f 3 7 3 3 3 3 7 7 7 3 3 3 DELETE FROM t1; INSERT INTO t1 VALUES (3), (7), (3); INSERT INTO t1 SELECT * FROM ( SELECT t1.f FROM v1 JOIN t1 ON v1.f=t1.f) AS t WHERE f IS NOT NULL; EXPLAIN FORMAT=JSON INSERT INTO t1 SELECT * FROM ( SELECT t1.f FROM v1 JOIN t1 ON v1.f=t1.f) AS t WHERE f IS NOT NULL; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 16, "filtered": 100, "attached_condition": "t.f is not null", "materialized": { "query_block": { "select_id": 2, "table": { "table_name": "t1", "access_type": "ALL", "rows": 8, "filtered": 100, "attached_condition": "t1.f is not null" }, "table": { "table_name": "", "access_type": "ref", "possible_keys": ["key0"], "key": "key0", "key_length": "4", "used_key_parts": ["f"], "ref": ["test.t1.f"], "rows": 2, "filtered": 100, "materialized": { "query_block": { "select_id": 3, "table": { "table_name": "t1", "access_type": "ALL", "rows": 8, "filtered": 100, "attached_condition": "t1.f is not null" } } } } } } } } } SELECT * FROM t1; f 3 7 3 3 3 7 3 3 DROP VIEW v1; DROP TABLE t1; # # MDEV-17574: pushdown into derived from mergeable view # used in multi-table UPDATE # pushdown into materialized derived from mergeable view # used in SELECT # CREATE TABLE t1 (f1 text, f2 int); INSERT INTO t1 VALUES ('x',1), ('y',2); CREATE VIEW v1 AS SELECT f2 FROM ( SELECT f2 FROM t1 ) AS t; UPDATE v1, t1 SET t1.f1 = 'z' WHERE v1.f2 < 2 AND t1.f2 = v1.f2; EXPLAIN FORMAT=JSON UPDATE v1, t1 SET t1.f1 = 'z' WHERE v1.f2 < 2 AND t1.f2 = v1.f2; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "t.f2 < 2", "materialized": { "query_block": { "select_id": 3, "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "t1.f2 < 2" } } } }, "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "t1.f2 = t.f2" } } } SELECT * FROM t1; f1 f2 z 1 y 2 CREATE VIEW v2 AS SELECT f2 FROM ( SELECT DISTINCT f2 FROM t1 ) AS t; SELECT * FROM v2, t1 WHERE v2.f2 < 2 AND t1.f2 = v2.f2; f2 f1 f2 1 z 1 EXPLAIN FORMAT=JSON SELECT * FROM v2, t1 WHERE v2.f2 < 2 AND t1.f2 = v2.f2; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "t.f2 < 2", "materialized": { "query_block": { "select_id": 3, "temporary_table": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100, "attached_condition": "t1.f2 < 2" } } } } }, "block-nl-join": { "table": { "table_name": "t1", "access_type": "ALL", "rows": 2, "filtered": 100 }, "buffer_type": "flat", "buffer_size": "256Kb", "join_type": "BNL", "attached_condition": "t1.f2 = t.f2" } } } DROP VIEW v1,v2; DROP TABLE t1; # # MDEV-18383: pushdown condition with the IF structure # defined with Item_cond item # CREATE TABLE t1(a INT, b INT); CREATE TABLE t2(c INT, d INT); INSERT INTO t1 VALUES (1,2),(3,4),(5,6); INSERT INTO t2 VALUES (1,3),(3,7),(5,1); SELECT * FROM t1, ( SELECT MAX(d) AS max_d,c FROM t2 GROUP BY c ) AS tab WHERE t1.a=tab.c AND IF(2,t1.a=1 OR t1.b>5,1=1); a b max_d c 1 2 3 1 5 6 1 5 DROP TABLE t1,t2; # # MDEV-19139: pushdown condition with Item_func_set_user_var # CREATE TABLE t1 (a INT, b INT); CREATE VIEW v1 AS SELECT a, MAX(b) FROM t1 GROUP BY a; SELECT * FROM (SELECT 1 FROM v1 UNION (SELECT 1 FROM v1 WHERE @a := uuid())) dt; 1 EXPLAIN FORMAT=JSON SELECT * FROM (SELECT 1 FROM v1 UNION (SELECT 1 FROM v1 WHERE @a := uuid())) dt; EXPLAIN { "query_block": { "select_id": 1, "table": { "table_name": "", "access_type": "ALL", "rows": 2, "filtered": 100, "materialized": { "query_block": { "union_result": { "table_name": "", "access_type": "ALL", "query_specifications": [ { "query_block": { "select_id": 2, "table": { "message": "no matching row in const table" } } }, { "query_block": { "select_id": 3, "table": { "message": "no matching row in const table" } } } ] } } } } } } DROP TABLE t1; DROP VIEW v1; # End of 10.2 tests