diff options
Diffstat (limited to 'mysql-test/main/limit_rows_examined.result')
| -rw-r--r-- | mysql-test/main/limit_rows_examined.result | 865 |
1 files changed, 865 insertions, 0 deletions
diff --git a/mysql-test/main/limit_rows_examined.result b/mysql-test/main/limit_rows_examined.result new file mode 100644 index 00000000000..7d1ca948c8b --- /dev/null +++ b/mysql-test/main/limit_rows_examined.result @@ -0,0 +1,865 @@ +call mtr.add_suppression("Sort aborted.*"); +set @save_join_cache_level = @@join_cache_level; +create table t1 (c1 char(2)); +create table t2 (c2 char(2)); +insert into t1 values ('bb'), ('cc'), ('aa'), ('dd'); +insert into t2 values ('bb'), ('cc'), ('dd'), ('ff'); +create table t1i (c1 char(2) key); +create table t2i (c2 char(2) key); +insert into t1i values ('bb'), ('cc'), ('aa'), ('dd'); +insert into t2i values ('bb'), ('cc'), ('dd'), ('ff'); +========================================================================= +Simple joins +========================================================================= +Simple nested loops join without blocking +set @@join_cache_level=0; +explain +select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 2; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 4 +1 SIMPLE t2 ALL NULL NULL NULL NULL 4 Using where +select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 2; +c1 c2 +bb bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 3 rows, which exceeds LIMIT ROWS EXAMINED (2). The query result may be incomplete +explain +select * from t1i, t2i where c1 = c2 LIMIT ROWS EXAMINED 4; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1i index PRIMARY PRIMARY 2 NULL 4 Using index +1 SIMPLE t2i eq_ref PRIMARY PRIMARY 2 test.t1i.c1 1 Using index +select * from t1i, t2i where c1 = c2 LIMIT ROWS EXAMINED 4; +c1 c2 +bb bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 5 rows, which exceeds LIMIT ROWS EXAMINED (4). The query result may be incomplete +Blocked nested loops join, empty result set because of blocking +set @@join_cache_level=1; +explain +select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 6; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 4 +1 SIMPLE t2 ALL NULL NULL NULL NULL 4 Using where; Using join buffer (flat, BNL join) +select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 6; +c1 c2 +bb bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 7 rows, which exceeds LIMIT ROWS EXAMINED (6). The query result may be incomplete +explain +select * from t1i, t2i where c1 = c2 LIMIT ROWS EXAMINED 6; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1i index PRIMARY PRIMARY 2 NULL 4 Using index +1 SIMPLE t2i index PRIMARY PRIMARY 2 NULL 4 Using where; Using index; Using join buffer (flat, BNL join) +select * from t1i, t2i where c1 = c2 LIMIT ROWS EXAMINED 6; +c1 c2 +bb bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 7 rows, which exceeds LIMIT ROWS EXAMINED (6). The query result may be incomplete +set @@join_cache_level=6; +explain +select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 3; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 4 Using where +1 SIMPLE t2 hash_ALL NULL #hash#$hj 3 test.t1.c1 4 Using where; Using join buffer (flat, BNLH join) +select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 3; +c1 c2 +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 4 rows, which exceeds LIMIT ROWS EXAMINED (3). The query result may be incomplete +explain +select * from t1i, t2i where c1 = c2 LIMIT ROWS EXAMINED 6; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1i index PRIMARY PRIMARY 2 NULL 4 Using index +1 SIMPLE t2i index PRIMARY PRIMARY 2 NULL 4 Using where; Using index; Using join buffer (flat, BNL join) +select * from t1i, t2i where c1 = c2 LIMIT ROWS EXAMINED 6; +c1 c2 +bb bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 7 rows, which exceeds LIMIT ROWS EXAMINED (6). The query result may be incomplete +Mix LIMIT ROWS EXAMINED with LIMIT +set @@join_cache_level=0; +explain +select * from t1, t2 where c1 < c2 LIMIT 1 ROWS EXAMINED 4; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 4 +1 SIMPLE t2 ALL NULL NULL NULL NULL 4 Using where +select * from t1, t2 where c1 < c2 LIMIT 1 ROWS EXAMINED 4; +c1 c2 +bb cc +explain +select * from t1, t2 where c1 < c2 LIMIT 1,1 ROWS EXAMINED 4; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 4 +1 SIMPLE t2 ALL NULL NULL NULL NULL 4 Using where +select * from t1, t2 where c1 < c2 LIMIT 1,1 ROWS EXAMINED 4; +c1 c2 +bb dd +Empty table optimized away during constant optimization +create table t0 (c0 int); +explain +select * from t0 LIMIT ROWS EXAMINED 0; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t0 system NULL NULL NULL NULL 0 Const row not found +explain +select * from t0 LIMIT ROWS EXAMINED 1; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t0 system NULL NULL NULL NULL 0 Const row not found +select * from t0 LIMIT ROWS EXAMINED 1; +c0 +drop table t0; +create table t0 (c0 char(2) primary key); +insert into t0 values ('bb'), ('cc'), ('aa'); +explain +select * from t0 where c0 = 'bb' LIMIT ROWS EXAMINED 0; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t0 const PRIMARY PRIMARY 2 const 1 Using index +select * from t0 where c0 = 'bb' LIMIT ROWS EXAMINED 0; +c0 +bb +explain +select * from t0, t1 where c0 = 'bb' and c1 > c0 LIMIT ROWS EXAMINED 0; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t0 const PRIMARY PRIMARY 2 const 1 Using index +1 SIMPLE t1 ALL NULL NULL NULL NULL 4 Using where +select * from t0, t1 where c0 = 'bb' and c1 > c0 LIMIT ROWS EXAMINED 0; +c0 c1 +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 2 rows, which exceeds LIMIT ROWS EXAMINED (0). The query result may be incomplete +set @@join_cache_level = @save_join_cache_level; +drop table t0; +========================================================================= +LIMIT ROWS EXAMINED with parameter argument +========================================================================= +set @@join_cache_level=0; +set @l = 2; +Prepared statement parameter +prepare st1 from "select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED ?"; +execute st1 using @l; +c1 c2 +bb bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 3 rows, which exceeds LIMIT ROWS EXAMINED (2). The query result may be incomplete +deallocate prepare st1; +User variable (not supported for LIMIT in MariaDB 5.3/MySQL 5.1) +select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED @l; +ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '@l' at line 1 +Stored procedure parameter +create procedure test_limit_rows(l int) +begin +select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED l; +end| +call test_limit_rows(3); +c1 c2 +bb bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 4 rows, which exceeds LIMIT ROWS EXAMINED (3). The query result may be incomplete +drop procedure test_limit_rows; +set @@join_cache_level = @save_join_cache_level; +========================================================================= +UNIONs (with several LIMIT ROWS EXAMINED clauses) +========================================================================= +(select * from t1, t2 where c1 = c2) +UNION +(select * from t1, t2 where c1 < c2) LIMIT ROWS EXAMINED 6; +c1 c2 +bb bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 8 rows, which exceeds LIMIT ROWS EXAMINED (6). The query result may be incomplete +(select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 0) +UNION +(select * from t1, t2 where c1 < c2 LIMIT ROWS EXAMINED 6); +c1 c2 +bb bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 8 rows, which exceeds LIMIT ROWS EXAMINED (6). The query result may be incomplete +select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 0 +UNION +select * from t1, t2 where c1 < c2 LIMIT ROWS EXAMINED 6; +ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'UNION +select * from t1, t2 where c1 < c2 LIMIT ROWS EXAMINED 6' at line 2 +(select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 0) +UNION +(select * from t1, t2 where c1 < c2 LIMIT ROWS EXAMINED 0) +LIMIT ROWS EXAMINED 6; +c1 c2 +bb bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 8 rows, which exceeds LIMIT ROWS EXAMINED (6). The query result may be incomplete +(select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 0) +UNION +(select * from t1, t2 where c1 < c2 LIMIT ROWS EXAMINED 0) +LIMIT 1 ROWS EXAMINED 6; +c1 c2 +bb bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 8 rows, which exceeds LIMIT ROWS EXAMINED (6). The query result may be incomplete +(select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 0) +UNION +(select * from t1, t2 where c1 < c2 LIMIT ROWS EXAMINED 0) +LIMIT 2 ROWS EXAMINED 10; +c1 c2 +bb bb +cc cc +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 12 rows, which exceeds LIMIT ROWS EXAMINED (10). The query result may be incomplete +========================================================================= +Subqueries (with several LIMIT ROWS EXAMINED clauses) +========================================================================= +Subqueries, semi-join +explain +select * from t1 +where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 11); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 ALL NULL NULL NULL NULL 4 +1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 2 func 1 +2 MATERIALIZED t2 ALL NULL NULL NULL NULL 4 Using where +select * from t1 +where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 11); +c1 +bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 12 rows, which exceeds LIMIT ROWS EXAMINED (11). The query result may be incomplete +explain +select * from t1 +where c1 IN (select * from t2 where c2 > ' ') +LIMIT ROWS EXAMINED 11; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 ALL NULL NULL NULL NULL 4 +1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 2 func 1 +2 MATERIALIZED t2 ALL NULL NULL NULL NULL 4 Using where +select * from t1 +where c1 IN (select * from t2 where c2 > ' ') +LIMIT ROWS EXAMINED 11; +c1 +bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 12 rows, which exceeds LIMIT ROWS EXAMINED (11). The query result may be incomplete +explain +select * from t1 +where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0) +LIMIT ROWS EXAMINED 11; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 ALL NULL NULL NULL NULL 4 +1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 2 func 1 +2 MATERIALIZED t2 ALL NULL NULL NULL NULL 4 Using where +select * from t1 +where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0) +LIMIT ROWS EXAMINED 11; +c1 +bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 12 rows, which exceeds LIMIT ROWS EXAMINED (11). The query result may be incomplete +explain +select * from t1i +where c1 IN (select * from t2i where c2 > ' ') +LIMIT ROWS EXAMINED 6; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1i index PRIMARY PRIMARY 2 NULL 4 Using where; Using index +1 PRIMARY t2i index PRIMARY PRIMARY 2 NULL 4 Using where; Using index; Using join buffer (flat, BNL join) +select * from t1i +where c1 IN (select * from t2i where c2 > ' ') +LIMIT ROWS EXAMINED 6; +c1 +bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 7 rows, which exceeds LIMIT ROWS EXAMINED (6). The query result may be incomplete +Subqueries with IN-TO-EXISTS +set @@optimizer_switch='semijoin=off,in_to_exists=on,materialization=off'; +explain +select * from t1 +where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 4); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 ALL NULL NULL NULL NULL 4 Using where +2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 4 Using where +select * from t1 +where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 4); +c1 +bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 5 rows, which exceeds LIMIT ROWS EXAMINED (4). The query result may be incomplete +explain +select * from t1 +where c1 IN (select * from t2 where c2 > ' ') +LIMIT ROWS EXAMINED 4; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 ALL NULL NULL NULL NULL 4 Using where +2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 4 Using where +select * from t1 +where c1 IN (select * from t2 where c2 > ' ') +LIMIT ROWS EXAMINED 4; +c1 +bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 5 rows, which exceeds LIMIT ROWS EXAMINED (4). The query result may be incomplete +explain +select * from t1 +where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0) +LIMIT ROWS EXAMINED 4; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 ALL NULL NULL NULL NULL 4 Using where +2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 4 Using where +select * from t1 +where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0) +LIMIT ROWS EXAMINED 4; +c1 +bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 5 rows, which exceeds LIMIT ROWS EXAMINED (4). The query result may be incomplete +explain +select * from t1i +where c1 IN (select * from t2i where c2 > ' ') +LIMIT ROWS EXAMINED 9; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1i index NULL PRIMARY 2 NULL 4 Using where; Using index +2 DEPENDENT SUBQUERY t2i unique_subquery PRIMARY PRIMARY 2 func 1 Using index; Using where +select * from t1i +where c1 IN (select * from t2i where c2 > ' ') +LIMIT ROWS EXAMINED 9; +c1 +bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 12 rows, which exceeds LIMIT ROWS EXAMINED (9). The query result may be incomplete +Same as above, without subquery cache +set @@optimizer_switch='subquery_cache=off'; +select * from t1 +where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 2); +c1 +bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 3 rows, which exceeds LIMIT ROWS EXAMINED (2). The query result may be incomplete +select * from t1 +where c1 IN (select * from t2 where c2 > ' ') +LIMIT ROWS EXAMINED 2; +c1 +bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 3 rows, which exceeds LIMIT ROWS EXAMINED (2). The query result may be incomplete +select * from t1 +where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0) +LIMIT ROWS EXAMINED 2; +c1 +bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 3 rows, which exceeds LIMIT ROWS EXAMINED (2). The query result may be incomplete +select * from t1i +where c1 IN (select * from t2i where c2 > ' ') +LIMIT ROWS EXAMINED 5; +c1 +bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 7 rows, which exceeds LIMIT ROWS EXAMINED (5). The query result may be incomplete +Subqueries with materialization +set @@optimizer_switch='semijoin=off,in_to_exists=off,materialization=on,subquery_cache=on'; +explain +select * from t1 +where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 13); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 ALL NULL NULL NULL NULL 4 Using where +2 MATERIALIZED t2 ALL NULL NULL NULL NULL 4 Using where +select * from t1 +where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 13); +c1 +bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 14 rows, which exceeds LIMIT ROWS EXAMINED (13). The query result may be incomplete +explain +select * from t1 +where c1 IN (select * from t2 where c2 > ' ') LIMIT ROWS EXAMINED 13; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 ALL NULL NULL NULL NULL 4 Using where +2 MATERIALIZED t2 ALL NULL NULL NULL NULL 4 Using where +select * from t1 +where c1 IN (select * from t2 where c2 > ' ') LIMIT ROWS EXAMINED 13; +c1 +bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 14 rows, which exceeds LIMIT ROWS EXAMINED (13). The query result may be incomplete +explain +select * from t1 +where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0) +LIMIT ROWS EXAMINED 13; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 ALL NULL NULL NULL NULL 4 Using where +2 MATERIALIZED t2 ALL NULL NULL NULL NULL 4 Using where +select * from t1 +where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0) +LIMIT ROWS EXAMINED 13; +c1 +bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 14 rows, which exceeds LIMIT ROWS EXAMINED (13). The query result may be incomplete +explain +select * from t1i +where c1 IN (select * from t2i where c2 > ' ') LIMIT ROWS EXAMINED 17; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1i index NULL PRIMARY 2 NULL 4 Using where; Using index +2 MATERIALIZED t2i index PRIMARY PRIMARY 2 NULL 4 Using where; Using index +select * from t1i +where c1 IN (select * from t2i where c2 > ' ') LIMIT ROWS EXAMINED 17; +c1 +bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 18 rows, which exceeds LIMIT ROWS EXAMINED (17). The query result may be incomplete +set @@optimizer_switch='default'; +========================================================================= +Views and derived tables +========================================================================= +create view v1 as +select * from t1 where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 13); +ERROR 42000: This version of MariaDB doesn't yet support 'LIMIT ROWS EXAMINED inside views' +create view v1 as +select * from t1 where c1 IN (select * from t2 where c2 > ' '); +select * from v1; +c1 +bb +cc +dd +select * from v1 LIMIT ROWS EXAMINED 17; +c1 +bb +cc +dd +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 18 rows, which exceeds LIMIT ROWS EXAMINED (17). The query result may be incomplete +select * from v1 LIMIT ROWS EXAMINED 16; +c1 +bb +cc +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 17 rows, which exceeds LIMIT ROWS EXAMINED (16). The query result may be incomplete +select * from v1 LIMIT ROWS EXAMINED 11; +c1 +bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 12 rows, which exceeds LIMIT ROWS EXAMINED (11). The query result may be incomplete +drop view v1; +explain +select * +from (select * from t1 +where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0)) as tmp +LIMIT ROWS EXAMINED 11; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 ALL NULL NULL NULL NULL 4 +1 PRIMARY <subquery3> eq_ref distinct_key distinct_key 2 func 1 +3 MATERIALIZED t2 ALL NULL NULL NULL NULL 4 Using where +select * +from (select * from t1 +where c1 IN (select * from t2 where c2 > ' ' LIMIT ROWS EXAMINED 0)) as tmp +LIMIT ROWS EXAMINED 11; +c1 +bb +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 12 rows, which exceeds LIMIT ROWS EXAMINED (11). The query result may be incomplete +========================================================================= +Aggregation +========================================================================= +create table t3 (c1 char(2), c2 int); +insert into t3 values +('aa', 1), ('aa', 2), +('bb', 3), ('bb', 4), ('bb', 5); +explain +select c1, sum(c2) from t3 group by c1; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t3 ALL NULL NULL NULL NULL 5 Using temporary; Using filesort +select c1, sum(c2) from t3 group by c1; +c1 sum(c2) +aa 3 +bb 12 +explain +select c1, sum(c2) from t3 group by c1 LIMIT ROWS EXAMINED 0; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t3 ALL NULL NULL NULL NULL 5 Using temporary; Using filesort +select c1, sum(c2) from t3 group by c1 LIMIT ROWS EXAMINED 0; +c1 sum(c2) +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 1 rows, which exceeds LIMIT ROWS EXAMINED (0). The query result may be incomplete +select c1, sum(c2) from t3 group by c1 LIMIT ROWS EXAMINED 1; +c1 sum(c2) +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 3 rows, which exceeds LIMIT ROWS EXAMINED (1). The query result may be incomplete +select c1, sum(c2) from t3 group by c1 LIMIT ROWS EXAMINED 20; +c1 sum(c2) +aa 3 +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 21 rows, which exceeds LIMIT ROWS EXAMINED (20). The query result may be incomplete +select c1, sum(c2) from t3 group by c1 LIMIT ROWS EXAMINED 21; +c1 sum(c2) +aa 3 +bb 12 +create table t3i (c1 char(2), c2 int); +create index it3i on t3i(c1); +create index it3j on t3i(c2,c1); +insert into t3i values +('aa', 1), ('aa', 2), +('bb', 3), ('bb', 4), ('bb', 5); +explain +select c1, sum(c2) from t3i group by c1 LIMIT ROWS EXAMINED 0; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t3i index NULL it3j 8 NULL 5 Using index; Using temporary; Using filesort +select c1, sum(c2) from t3i group by c1 LIMIT ROWS EXAMINED 0; +c1 sum(c2) +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 1 rows, which exceeds LIMIT ROWS EXAMINED (0). The query result may be incomplete +select c1, sum(c2) from t3i group by c1 LIMIT ROWS EXAMINED 1; +c1 sum(c2) +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 3 rows, which exceeds LIMIT ROWS EXAMINED (1). The query result may be incomplete +select c1, sum(c2) from t3i group by c1 LIMIT ROWS EXAMINED 20; +c1 sum(c2) +aa 3 +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 21 rows, which exceeds LIMIT ROWS EXAMINED (20). The query result may be incomplete +select c1, sum(c2) from t3i group by c1 LIMIT ROWS EXAMINED 21; +c1 sum(c2) +aa 3 +bb 12 +Aggregation without grouping +explain +select min(c2) from t3 LIMIT ROWS EXAMINED 5; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t3 ALL NULL NULL NULL NULL 5 +select min(c2) from t3 LIMIT ROWS EXAMINED 5; +min(c2) +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 6 rows, which exceeds LIMIT ROWS EXAMINED (5). The query result may be incomplete +select max(c2) from t3 LIMIT ROWS EXAMINED 6; +max(c2) +5 +select max(c2) from t3 LIMIT ROWS EXAMINED 0; +max(c2) +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 1 rows, which exceeds LIMIT ROWS EXAMINED (0). The query result may be incomplete +explain +select max(c2) from t3 where c2 > 10 LIMIT ROWS EXAMINED 5; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t3 ALL NULL NULL NULL NULL 5 Using where +select max(c2) from t3 where c2 > 10 LIMIT ROWS EXAMINED 5; +max(c2) +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 6 rows, which exceeds LIMIT ROWS EXAMINED (5). The query result may be incomplete +select max(c2) from t3 where c2 > 10 LIMIT ROWS EXAMINED 6; +max(c2) +NULL +select max(c2) from t3 where c2 > 10 LIMIT ROWS EXAMINED 0; +max(c2) +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 1 rows, which exceeds LIMIT ROWS EXAMINED (0). The query result may be incomplete +explain +select count(c2) from t3 LIMIT ROWS EXAMINED 5; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t3 ALL NULL NULL NULL NULL 5 +select count(c2) from t3 LIMIT ROWS EXAMINED 5; +count(c2) +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 6 rows, which exceeds LIMIT ROWS EXAMINED (5). The query result may be incomplete +select count(c2) from t3 LIMIT ROWS EXAMINED 6; +count(c2) +5 +select count(c2) from t3 LIMIT ROWS EXAMINED 0; +count(c2) +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 1 rows, which exceeds LIMIT ROWS EXAMINED (0). The query result may be incomplete +explain +select count(c2) from t3 where c2 > 10 LIMIT ROWS EXAMINED 5; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t3 ALL NULL NULL NULL NULL 5 Using where +select count(c2) from t3 where c2 > 10 LIMIT ROWS EXAMINED 5; +count(c2) +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 6 rows, which exceeds LIMIT ROWS EXAMINED (5). The query result may be incomplete +select count(c2) from t3 where c2 > 10 LIMIT ROWS EXAMINED 6; +count(c2) +0 +explain +select sum(c2) from t3 LIMIT ROWS EXAMINED 5; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t3 ALL NULL NULL NULL NULL 5 +select sum(c2) from t3 LIMIT ROWS EXAMINED 5; +sum(c2) +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 6 rows, which exceeds LIMIT ROWS EXAMINED (5). The query result may be incomplete +select sum(c2) from t3 LIMIT ROWS EXAMINED 6; +sum(c2) +15 +The query result is found during optimization, LIMIT ROWS EXAMINED has no effect. +explain +select max(c1) from t3i LIMIT ROWS EXAMINED 0; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away +select max(c1) from t3i LIMIT ROWS EXAMINED 0; +max(c1) +bb +create table t3_empty like t3; +explain +select max(c1) from t3_empty LIMIT ROWS EXAMINED 0; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t3_empty system NULL NULL NULL NULL 0 Const row not found +select max(c1) from t3_empty LIMIT ROWS EXAMINED 0; +max(c1) +NULL +drop table t3_empty; +========================================================================= +Sorting +========================================================================= +explain +select c1, c2 from t3 order by c2, c1 LIMIT ROWS EXAMINED 2; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t3 ALL NULL NULL NULL NULL 5 Using filesort +select c1, c2 from t3 order by c2, c1 LIMIT ROWS EXAMINED 2; +ERROR HY000: Sort aborted: +explain +select c1, c2 from t3i order by c2, c1 LIMIT ROWS EXAMINED 2; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t3i index NULL it3j 8 NULL 5 Using index +select c1, c2 from t3i order by c2, c1 LIMIT ROWS EXAMINED 2; +c1 c2 +aa 1 +aa 2 +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 3 rows, which exceeds LIMIT ROWS EXAMINED (2). The query result may be incomplete +explain +select c1, c2 from t3i order by c2, c1 desc LIMIT ROWS EXAMINED 2; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t3i index NULL it3j 8 NULL 5 Using index; Using filesort +select c1, c2 from t3i order by c2, c1 desc LIMIT ROWS EXAMINED 2; +ERROR HY000: Sort aborted: +drop table t3,t3i; +========================================================================= +INSERT/DELETE/UPDATE +========================================================================= +INSERT ... SELECT +CREATE TABLE t4 (a int); +INSERT INTO t4 values (1), (2); +INSERT IGNORE INTO t4 SELECT a + 2 FROM t4 LIMIT ROWS EXAMINED 0; +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 1 rows, which exceeds LIMIT ROWS EXAMINED (0). The query result may be incomplete +select * from t4; +a +1 +2 +INSERT INTO t4 SELECT a + 2 FROM t4 LIMIT ROWS EXAMINED 6; +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 8 rows, which exceeds LIMIT ROWS EXAMINED (6). The query result may be incomplete +select * from t4; +a +1 +2 +3 +drop table t4; +DELETE - LIMIT ROWS EXAMINED not supported +CREATE TABLE t4 (a int); +INSERT INTO t4 values (1), (2); +DELETE FROM t4 WHERE t4.a > 0 LIMIT ROWS EXAMINED 0; +ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'EXAMINED 0' at line 1 +DELETE FROM t4 WHERE t4.a > 0 LIMIT 0 ROWS EXAMINED 0; +ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'EXAMINED 0' at line 1 +drop table t4; +UPDATE - LIMIT ROWS EXAMINED not supported +CREATE TABLE t4 (a int); +INSERT INTO t4 values (1), (2); +update t4 set a=a+10 LIMIT ROWS EXAMINED 0; +ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'EXAMINED 0' at line 1 +update t4 set a=a+10 LIMIT 0 ROWS EXAMINED 0; +ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'EXAMINED 0' at line 1 +drop table t4; +drop table t1,t2,t1i,t2i; +========================================================================= +Test cases for bugs +========================================================================= + +MDEV-115 + +SET @@optimizer_switch='in_to_exists=on,outer_join_with_cache=on'; +CREATE TABLE t1 ( a VARCHAR(3) ) ENGINE=MyISAM; +INSERT INTO t1 VALUES ('USA'),('CAN'); +CREATE TABLE t2 ( b INT ); +INSERT INTO t2 VALUES (3899),(3914),(3888); +CREATE TABLE t3 ( c VARCHAR(33), d INT ); +INSERT INTO t3 VALUES ('USASpanish',8),('USATagalog',0),('USAVietnamese',0); +EXPLAIN +SELECT DISTINCT a AS field1 FROM t1, t2 +WHERE EXISTS (SELECT c FROM t3 LEFT JOIN t2 ON b = d) +HAVING field1 > 'aaa' LIMIT ROWS EXAMINED 20; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using temporary +1 PRIMARY t2 ALL NULL NULL NULL NULL 3 Using join buffer (flat, BNL join) +2 SUBQUERY t3 ALL NULL NULL NULL NULL 3 +2 SUBQUERY t2 ALL NULL NULL NULL NULL 3 Using where; Using join buffer (flat, BNL join) +SELECT DISTINCT a AS field1 FROM t1, t2 +WHERE EXISTS (SELECT c FROM t3 LEFT JOIN t2 ON b = d) +HAVING field1 > 'aaa' LIMIT ROWS EXAMINED 20; +field1 +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 21 rows, which exceeds LIMIT ROWS EXAMINED (20). The query result may be incomplete +EXPLAIN +SELECT DISTINCT a FROM t1, t2 HAVING a > ' ' LIMIT ROWS EXAMINED 14; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using temporary +1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using join buffer (flat, BNL join) +SELECT DISTINCT a FROM t1, t2 HAVING a > ' ' LIMIT ROWS EXAMINED 14; +a +USA +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 15 rows, which exceeds LIMIT ROWS EXAMINED (14). The query result may be incomplete +SELECT DISTINCT a FROM t1, t2 HAVING a > ' ' LIMIT ROWS EXAMINED 15; +a +USA +CAN +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 16 rows, which exceeds LIMIT ROWS EXAMINED (15). The query result may be incomplete +SELECT DISTINCT a FROM t1, t2 HAVING a > ' ' LIMIT ROWS EXAMINED 16; +a +USA +CAN +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 17 rows, which exceeds LIMIT ROWS EXAMINED (16). The query result may be incomplete +drop table t1,t2,t3; +set @@optimizer_switch='default'; + +MDEV-153 + +CREATE TABLE t1 ( a TIME, b DATETIME, KEY(a), KEY(b) ) ENGINE=MyISAM; +INSERT INTO t1 VALUES +('21:22:34.025509', '2002-02-13 17:30:06.013935'), +('10:50:38.059966', '2008-09-27 00:34:58.026613'), +('00:21:38.058143', '2007-05-28 00:00:00'); +CREATE TABLE t2 ( c INT, d TIME, e DATETIME, f VARCHAR(1), KEY(c) ) ENGINE=MyISAM; +INSERT INTO t2 VALUES +(0, '11:03:22.062907', '2007-06-02 11:16:01.053212', 'a'), +(0, '08:14:05.001407', '1900-01-01 00:00:00', 'm'), +(5, '19:03:16.024974', '1900-01-01 00:00:00', 'f'), +(1, '07:23:34.034234', '2000-11-26 05:01:11.054228', 'z'), +(6, '12:29:32.019411', '2006-02-13 00:00:00', 'f'), +(6, '06:07:10.010496', '2007-06-08 04:35:26.020373', 'a'), +(7, '22:55:09.020772', '2005-04-27 00:00:00', 'i'); +EXPLAIN +SELECT a AS field1, alias2.d AS field2, alias2.f AS field3, alias2.e AS field4, b AS field5 +FROM t1, t2 AS alias2, t2 AS alias3 +WHERE alias3.c IN ( SELECT 1 UNION SELECT 6 ) +GROUP BY field1, field2, field3, field4, field5 +LIMIT ROWS EXAMINED 120; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using temporary; Using filesort +1 PRIMARY alias2 ALL NULL NULL NULL NULL 7 Using join buffer (flat, BNL join) +1 PRIMARY alias3 index NULL c 5 NULL 7 Using where; Using index; Using join buffer (incremental, BNL join) +2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL No tables used +3 DEPENDENT UNION NULL NULL NULL NULL NULL NULL NULL No tables used +NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL +FLUSH STATUS; +SELECT a AS field1, alias2.d AS field2, alias2.f AS field3, alias2.e AS field4, b AS field5 +FROM t1, t2 AS alias2, t2 AS alias3 +WHERE alias3.c IN ( SELECT 1 UNION SELECT 6 ) +GROUP BY field1, field2, field3, field4, field5 +LIMIT ROWS EXAMINED 120; +field1 field2 field3 field4 field5 +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 121 rows, which exceeds LIMIT ROWS EXAMINED (120). The query result may be incomplete +SHOW STATUS LIKE 'Handler_read%'; +Variable_name Value +Handler_read_first 1 +Handler_read_key 4 +Handler_read_last 0 +Handler_read_next 4 +Handler_read_prev 0 +Handler_read_retry 0 +Handler_read_rnd 0 +Handler_read_rnd_deleted 0 +Handler_read_rnd_next 46 +SHOW STATUS LIKE 'Handler_tmp%'; +Variable_name Value +Handler_tmp_delete 0 +Handler_tmp_update 0 +Handler_tmp_write 66 +FLUSH STATUS; +SELECT a AS field1, alias2.d AS field2, alias2.f AS field3, alias2.e AS field4, b AS field5 +FROM t1, t2 AS alias2, t2 AS alias3 +WHERE alias3.c IN ( SELECT 1 UNION SELECT 6 ) +GROUP BY field1, field2, field3, field4, field5 +LIMIT ROWS EXAMINED 124; +field1 field2 field3 field4 field5 +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 125 rows, which exceeds LIMIT ROWS EXAMINED (124). The query result may be incomplete +Warning 1931 Query execution was interrupted. The query examined at least 127 rows, which exceeds LIMIT ROWS EXAMINED (124). The query result may be incomplete +SHOW STATUS LIKE 'Handler_read%'; +Variable_name Value +Handler_read_first 1 +Handler_read_key 4 +Handler_read_last 0 +Handler_read_next 4 +Handler_read_prev 0 +Handler_read_retry 0 +Handler_read_rnd 0 +Handler_read_rnd_deleted 0 +Handler_read_rnd_next 48 +SHOW STATUS LIKE 'Handler_tmp%'; +Variable_name Value +Handler_tmp_delete 0 +Handler_tmp_update 0 +Handler_tmp_write 70 +drop table t1, t2; + +MDEV-161 LIMIT_ROWS EXAMINED: query with the limit and NOT EXISTS, without GROUP BY or aggregate, +returns rows, while the same query without the limit returns empty set + +CREATE TABLE t1 ( a INT, b INT ); +INSERT INTO t1 VALUES (3911,17),(3847,33),(3857,26); +CREATE TABLE t2 ( c VARCHAR(16) ); +INSERT INTO t2 VALUES ('English'),('French'),('German'); +CREATE TABLE t3 ( d INT, e VARCHAR(32) ); +INSERT INTO t3 VALUES (3813,'United States'),(3814,'United States'); +SELECT * FROM t1 AS alias1, t2 AS alias2 +WHERE NOT EXISTS ( +SELECT * FROM t1 LEFT OUTER JOIN t3 +ON (d = a) +WHERE b <= alias1.b OR e != alias2.c +); +a b c +SELECT * FROM t1 AS alias1, t2 AS alias2 +WHERE NOT EXISTS ( +SELECT * FROM t1 LEFT OUTER JOIN t3 +ON (d = a) +WHERE b <= alias1.b OR e != alias2.c +) LIMIT ROWS EXAMINED 20; +a b c +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 25 rows, which exceeds LIMIT ROWS EXAMINED (20). The query result may be incomplete +drop table t1, t2, t3; + +MDEV-174: LIMIT ROWS EXAMINED: Assertion `0' failed in net_end_statement(THD*) +with subquery in SELECT, constant table, aggregate function + +CREATE TABLE t1 ( a INT ); +CREATE TABLE t2 ( b INT, c INT, KEY(c) ); +INSERT INTO t2 VALUES +(5, 0),(3, 4),(6, 1), +(5, 8),(4, 9),(8, 1); +SELECT (SELECT MAX(c) FROM t1, t2) +FROM t2 +WHERE c = (SELECT MAX(b) FROM t2) +LIMIT ROWS EXAMINED 3; +(SELECT MAX(c) FROM t1, t2) +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 10 rows, which exceeds LIMIT ROWS EXAMINED (3). The query result may be incomplete +drop table t1, t2; + +MDEV-178: LIMIT ROWS EXAMINED: Assertion `0' failed in net_end_statement(THD*) on the +2nd PS execution, with DISTINCT, FROM subquery or view in SELECT, JOIN in nested subquery + +CREATE TABLE t1 ( a INT ); +INSERT INTO t1 VALUES (2),(3),(150); +CREATE TABLE t2 ( b INT ); +INSERT INTO t2 VALUES (2),(17),(3),(6); +CREATE VIEW v AS +SELECT DISTINCT * FROM t1 WHERE a > (SELECT COUNT(*) FROM t1, t2 WHERE a = b); +PREPARE ps FROM 'SELECT * FROM v LIMIT ROWS EXAMINED 21'; +EXECUTE ps; +a +3 +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 22 rows, which exceeds LIMIT ROWS EXAMINED (21). The query result may be incomplete +EXECUTE ps; +a +3 +Warnings: +Warning 1931 Query execution was interrupted. The query examined at least 22 rows, which exceeds LIMIT ROWS EXAMINED (21). The query result may be incomplete +drop view v; +drop table t1, t2; |