# # EXPLAIN FORMAT=JSON tests. These are tests developed for MariaDB. # --source include/default_optimizer_switch.inc --disable_warnings drop table if exists t0,t1,t2; --enable_warnings create table t0(a int); insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); explain format=json select * from t0; explain format=json select * from t0 where 1>2; explain format=json select * from t0 where a<3; --echo # Try a basic join create table t1 (a int, b int, filler char(32), key(a)); insert into t1 select a.a + b.a* 10 + c.a * 100, a.a + b.a* 10 + c.a * 100, 'filler' from t0 a, t0 b, t0 c; explain format=json select * from t0,t1 where t1.a=t0.a; --echo # Try range and index_merge create table t2 (a1 int, a2 int, b1 int, b2 int, key(a1,a2), key(b1,b2)); insert into t2 select a,a,a,a from t1; explain format=json select * from t2 where a1<5; explain format=json select * from t2 where a1=1 or b1=2; explain format=json select * from t2 where a1=1 or (b1=2 and b2=3); explain format=json select * from t2 where (a1=1 and a2=1) or (b1=2 and b2=1); --echo # Try ref access on two key components explain format=json select * from t0,t2 where t2.b1=t0.a and t2.b2=4; drop table t1,t2; --echo # --echo # Try a UNION --echo # explain format=json select * from t0 A union select * from t0 B; explain format=json select * from t0 A union all select * from t0 B; --echo # --echo # Subqueries --echo # create table t1 (a int, b int); insert into t1 select a,a from t0; explain format=json select a, a > (select max(b) from t1 where t1.b=t0.a) from t0; explain format=json select * from t0 where a > (select max(b) from t1 where t1.b=t0.a) or a < 3 ; drop table t1; --echo # --echo # Join buffering --echo # create table t1 (a int, b int); insert into t1 select tbl1.a+10*tbl2.a, tbl1.a+10*tbl2.a from t0 tbl1, t0 tbl2; explain format=json select * from t1 tbl1, t1 tbl2 where tbl1.a=tbl2.a and tbl1.b < 3 and tbl2.b < 5; drop table t1; --echo # --echo # Single-table UPDATE/DELETE, INSERT --echo # explain format=json delete from t0; explain format=json delete from t0 where 1 > 2; explain format=json delete from t0 where a < 3; explain format=json update t0 set a=3 where a in (2,3,4); explain format=json insert into t0 values (1); create table t1 like t0; explain format=json insert into t1 values ((select max(a) from t0)); drop table t1; --echo # --echo # A derived table --echo # create table t1 (a int, b int); insert into t1 select a,a from t0; explain format=json select * from (select a, count(*) as cnt from t1 group by a) as tbl where cnt>0; explain format=json select * from (select a, count(*) as cnt from t1 group by a) as tbl1, t1 as tbl2 where cnt=tbl2.a; --echo # --echo # Non-merged semi-join (aka JTBM) --echo # explain format=json select * from t1 where a in (select max(a) from t1 group by b); --echo # --echo # Semi-join Materialization --echo # create table t2 like t1; insert into t2 select * from t1; explain format=json select * from t1,t2 where t1.a in ( select a from t0); --echo # --echo # First-Match --echo # explain select * from t2 where t2.a in ( select a from t1 where t1.b=t2.b); explain format=json select * from t2 where t2.a in ( select a from t1 where t1.b=t2.b); --echo # --echo # Duplicate Weedout --echo # set @tmp= @@optimizer_switch; set optimizer_switch='firstmatch=off'; explain select * from t2 where t2.a in ( select a from t1 where t1.b=t2.b); explain format=json select * from t2 where t2.a in ( select a from t1 where t1.b=t2.b); set optimizer_switch=@tmp; drop table t1,t2; --echo # --echo # MRR for range access (no BKA, just MRR) --echo # create table t1 (a int, b int, key(a)); insert into t1 select tbl1.a+10*tbl2.a, 12345 from t0 tbl1, t0 tbl2; set @tmp= @@optimizer_switch; set optimizer_switch='mrr=on,mrr_sort_keys=on'; explain format=json select * from t1 where a < 3; --echo # 'Range checked for each record' set optimizer_switch=@tmp; explain format=json select * from t1 tbl1, t1 tbl2 where tbl2.a < tbl1.b; drop table t1; drop table t0; --echo # --echo # MDEV-7265: "Full scan on NULL key", the join case --echo # CREATE TABLE t1 (a INT, KEY(a)); INSERT INTO t1 VALUES (1),(2); CREATE TABLE t2 (b INT); INSERT INTO t2 VALUES (3),(4); EXPLAIN FORMAT=JSON SELECT * FROM t1 AS outer_t1 WHERE a <> ALL ( SELECT a FROM t1, t2 WHERE b <> outer_t1.a ); DROP TABLE t1,t2; --echo # --echo # Join's constant expression --echo # create table t0(a int); insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); create table t1(a int, b int); insert into t1 select tbl1.a+10*tbl2.a, 1234 from t0 tbl1, t0 tbl2; explain format=json select * from t0 where 20000 > all (select max(tbl1.a + tbl2.a) from t1 tbl1, t1 tbl2 where tbl1.b=tbl2.b); drop table t1; drop table t0; --echo # --echo # MDEV-7264: Assertion `0' failed in subselect_engine::get_identifier() on EXPLAIN JSON --echo # CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1),(2); CREATE TABLE t2 (b INT); INSERT INTO t2 VALUES (3),(4); EXPLAIN FORMAT=JSON SELECT * FROM t1 WHERE a <> ALL ( SELECT b FROM t2 ); DROP TABLE t1, t2; --echo # --echo # MDEV-7927: Server crashes in in Time_and_counter_tracker::incr_loops --echo # CREATE TABLE t1 (i INT); INSERT INTO t1 VALUES (1),(2); EXPLAIN SELECT * FROM t1 WHERE 3 IN ( SELECT 4 UNION SELECT 5 ); DROP TABLE t1; --echo # --echo # MDEV-7860: EXPLAIN FORMAT=JSON crashes for loose scan query --echo # create table t2(a int); insert into t2 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); create table t1 (a int, b int, c int, d int, key(a,b,c)); insert into t1 select A.a, B.a, C.a, D.a from t2 A, t2 B, t2 C, t2 D; explain select count(distinct b) from t1 group by a; explain format=json select count(distinct b) from t1 group by a; --source include/analyze-format.inc analyze format=json select count(distinct b) from t1 group by a; drop table t1,t2; --echo # --echo # Try both variants of LooseScan (data/queries borrowed from group_min_max.test) --echo # create table t1 ( a1 char(64), a2 char(64), b char(16), c char(16) not null, d char(16), dummy char(248) default ' ' ); insert into t1 (a1, a2, b, c, d) values ('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'), ('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'), ('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'), ('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'), ('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'), ('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'), ('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'), ('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'), ('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'), ('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'), ('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'), ('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'), ('d','a','a','a411','xy1'),('d','a','a','b411','xy2'),('d','a','a','c411','xy3'),('d','a','a','d411','xy4'), ('d','a','b','e412','xy1'),('d','a','b','f412','xy2'),('d','a','b','g412','xy3'),('d','a','b','h412','xy4'), ('d','b','a','i421','xy1'),('d','b','a','j421','xy2'),('d','b','a','k421','xy3'),('d','b','a','l421','xy4'), ('d','b','b','m422','xy1'),('d','b','b','n422','xy2'),('d','b','b','o422','xy3'),('d','b','b','p422','xy4'), ('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'), ('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'), ('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'), ('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'), ('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'), ('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'), ('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'), ('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'), ('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'), ('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'), ('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'), ('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'), ('d','a','a','a411','xy1'),('d','a','a','b411','xy2'),('d','a','a','c411','xy3'),('d','a','a','d411','xy4'), ('d','a','b','e412','xy1'),('d','a','b','f412','xy2'),('d','a','b','g412','xy3'),('d','a','b','h412','xy4'), ('d','b','a','i421','xy1'),('d','b','a','j421','xy2'),('d','b','a','k421','xy3'),('d','b','a','l421','xy4'), ('d','b','b','m422','xy1'),('d','b','b','n422','xy2'),('d','b','b','o422','xy3'),('d','b','b','p422','xy4'); create index idx_t1_0 on t1 (a1); create index idx_t1_1 on t1 (a1,a2,b,c); create index idx_t1_2 on t1 (a1,a2,b); analyze table t1; explain select count(distinct a1,a2,b) from t1 where (a2 >= 'b') and (b = 'a'); explain select count(distinct a1,a2,b,c) from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121'); explain format=json select count(distinct a1,a2,b) from t1 where (a2 >= 'b') and (b = 'a'); explain format=json select count(distinct a1,a2,b,c) from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121'); drop table t1; --echo # --echo # MDEV-8786 Wrong result for SELECT FORMAT=JSON * FROM t1 WHERE a=_latin1 0xDF --echo # CREATE TABLE t1 (a VARCHAR(10) CHARACTER SET latin1); INSERT INTO t1 VALUES ('a'),('b'); EXPLAIN FORMAT=JSON SELECT * FROM t1 WHERE a=_latin1 0xDF; DROP TABLE t1; --echo # --echo # MDEV-8785 Wrong results for EXPLAIN EXTENDED...WHERE NULLIF(latin1_col, _utf8'a' COLLATE utf8_bin) IS NOT NULL --echo # CREATE TABLE t1 (a VARCHAR(10) CHARACTER SET latin1); INSERT INTO t1 VALUES ('a'),('A'); EXPLAIN FORMAT=JSON SELECT * FROM t1 WHERE NULLIF(a,_utf8'a' COLLATE utf8_bin); DROP TABLE t1; --echo # --echo # MDEV-7970: EXPLAIN FORMAT=JSON does not print HAVING --echo # create table t0(a int); insert into t0 values (0),(1),(2),(3); create table t1(a int); insert into t1 select A.a + B.a* 10 + C.a * 100 from t0 A, t0 B, t0 C; create table t2 ( a int, b int, key (a) ); insert into t2 select A.a*1000 + B.a, A.a*1000 + B.a from t0 A, t1 B; --echo # normal HAVING explain format=json select a, max(b) as TOP from t2 group by a having TOP > a; --echo # HAVING is always TRUE (not printed) explain format=json select a, max(b) as TOP from t2 group by a having 1<>2; --echo # HAVING is always FALSE (intercepted by message) explain format=json select a, max(b) as TOP from t2 group by a having 1=2; --echo # HAVING is absent explain format=json select a, max(b) as TOP from t2 group by a; drop table t0, t1, t2; --echo # --echo # MDEV-8829: Assertion `0' failed in Explain_table_access::tag_to_json --echo # --echo # Check ET_CONST_ROW_NOT_FOUND create table t1 (i int) engine=myisam; explain select * from t1; explain format=json select * from t1; analyze format=json select * from t1; drop table t1; --echo # Check ET_IMPOSSIBLE_ON_CONDITION create table t1 (a int); create table t2 (pk int primary key); insert into t1 values (1),(2); insert into t2 values (1),(2); explain select * from t1 left join t2 on t2.pk > 10 and t2.pk < 0; explain format=json select * from t1 left join t2 on t2.pk > 10 and t2.pk < 0; --source include/analyze-format.inc analyze format=json select * from t1 left join t2 on t2.pk > 10 and t2.pk < 0; --echo # Check ET_NOT_EXISTS: explain select * from t1 left join t2 on t2.pk=t1.a where t2.pk is null; explain format=json select * from t1 left join t2 on t2.pk=t1.a where t2.pk is null; --source include/analyze-format.inc analyze format=json select * from t1 left join t2 on t2.pk=t1.a where t2.pk is null; --echo # Check ET_DISTINCT explain select distinct t1.a from t1 join t2 on t2.pk=t1.a; explain format=json select distinct t1.a from t1 join t2 on t2.pk=t1.a; --source include/analyze-format.inc analyze format=json select distinct t1.a from t1 join t2 on t2.pk=t1.a; drop table t1,t2; --echo # Check ET_USING_INDEX_CONDITION_BKA create table t1(a int); insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); create table t2(a int); insert into t2 select A.a + B.a* 10 + C.a * 100 from t1 A, t1 B, t1 C; create table t3(a int, b int); insert into t3 select a,a from t1; create table t4(a int, b int, c int, filler char(100), key (a,b)); insert into t4 select a,a,a, 'filler-data' from t2; set @tmp_optimizer_switch=@@optimizer_switch; set @tmp_join_cache_level=@@join_cache_level; set optimizer_switch='mrr=on'; set join_cache_level=6; explain select * from t3,t4 where t3.a=t4.a and (t4.b+1 <= t3.b+1); explain format=json select * from t3,t4 where t3.a=t4.a and (t4.b+1 <= t3.b+1); --source include/analyze-format.inc analyze format=json select * from t3,t4 where t3.a=t4.a and (t4.b+1 <= t3.b+1); set optimizer_switch=@tmp_optimizer_switch; set join_cache_level=@tmp_join_cache_level; drop table t1,t2,t3,t4; --echo # --echo # MDEV-9652: EXPLAIN FORMAT=JSON should show outer_ref_cond --echo # create table t0(a int); insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); create table t1 (a int, b int); insert into t1 select a,a from t0; explain format=json select a, (select max(a) from t1 where t0.a<5 and t1.b