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Diffstat (limited to 'mysql-test/include/subselect_mat_cost.inc')
| -rw-r--r-- | mysql-test/include/subselect_mat_cost.inc | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/mysql-test/include/subselect_mat_cost.inc b/mysql-test/include/subselect_mat_cost.inc new file mode 100644 index 00000000..04b116e9 --- /dev/null +++ b/mysql-test/include/subselect_mat_cost.inc @@ -0,0 +1,152 @@ +-- echo +-- echo /* A. Subqueries in the SELECT clause. */ +explain +select a1, a1 in (select b1 from t2 where b1 > '0') from t1; +select a1, a1 in (select b1 from t2 where b1 > '0') from t1; +-- echo +explain +select a1, a2, (a1, a2) in (select b1, b2 from t2 where b1 > '0') from t1; +select a1, a2, (a1, a2) in (select b1, b2 from t2 where b1 > '0') from t1; +-- echo +explain +select a1, a2, (a1, a2) in (select b1, b2 from t2 where b1 > '0' and b1 < '9') from t1; +select a1, a2, (a1, a2) in (select b1, b2 from t2 where b1 > '0' and b1 < '9') from t1; + +-- echo +-- echo /* +-- echo B. "Natural" examples of subqueries without grouping that +-- echo cannot be flattened into semijoin. +-- echo */ + +explain +select a1 from t1 where a1 in (select b2 from t2) or a2 < '9'; +select a1 from t1 where a1 in (select b2 from t2) or a2 < '9'; +-- echo +explain +select a1, a2 from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0') or a2 < '9'; +select a1, a2 from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0') or a2 < '9'; +-- echo UNION subqueries are currently limited to only use IN-TO-EXISTS. +explain +select a2 from t1 where a2 in (select b2 from t2 UNION select b3 from t2 as t3); +select a2 from t1 where a2 in (select b2 from t2 UNION select b3 from t2 as t3); +-- echo +explain +select a1 from t1 where a1 = '1 - 02' and a1 in (select max(b1) from t2 where b2 = '2 - 02'); +select a1 from t1 where a1 = '1 - 02' and a1 in (select max(b1) from t2 where b2 = '2 - 02'); +-- echo +explain +select a1, a2 from t1 where (a1, a2) in (select b1, b2 from t2 order by b3); +select a1, a2 from t1 where (a1, a2) in (select b1, b2 from t2 order by b3); + +-- echo +-- echo /* C. Subqueries in the WHERE clause with GROUP BY. */ +explain +select * from t1 where a1 in (select b1 from t2 where b1 > '0' group by b1); +select * from t1 where a1 in (select b1 from t2 where b1 > '0' group by b1); +-- echo +explain +select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0' group by b1, b2); +select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0' group by b1, b2); +-- echo +explain +select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0' group by b1, b2 having b2 < '2 - 04'); +select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0' group by b1, b2 having b2 < '2 - 04'); +-- echo +explain +select * from t1 where (a1, a2, a3) in (select b1, b2, b3 from t2 group by b1, b2, b3); +select * from t1 where (a1, a2, a3) in (select b1, b2, b3 from t2 group by b1, b2, b3); +-- echo +explain +select * from t1 where (a1, a2, a3) in (select b1, b2, b3 from t2 where b3 = '3 - 02' group by b1, b2); +select * from t1 where (a1, a2, a3) in (select b1, b2, b3 from t2 where b3 = '3 - 02' group by b1, b2); +-- echo +explain +select * from t1 where (a1,a2,a3) in (select b1,b2,b3 from t2 where b1 = '1 - 01' group by b1,b2,b3); +select * from t1 where (a1,a2,a3) in (select b1,b2,b3 from t2 where b1 = '1 - 01' group by b1,b2,b3); + +-- echo +-- echo /* +-- echo D. Subqueries for which materialization is not possible, and the +-- echo optimizer reverts to in-to-exists. +-- echo */ +# The first two cases are rejected during the prepare phase by the procedure +# subquery_types_allow_materialization(). +explain +select left(a1,7), left(a2,7) from t1_1024 where a1 in (select b1 from t2_1024 where b1 > '0') or a2 < '9'; +select left(a1,7), left(a2,7) from t1_1024 where a1 in (select b1 from t2_1024 where b1 > '0') or a2 < '9'; +explain +select left(a1,7), left(a2,7) from t1_1024 where (a1,a2) in (select b1, b2 from t2_1024 where b1 > '0') or a2 < '9'; +select left(a1,7), left(a2,7) from t1_1024 where (a1,a2) in (select b1, b2 from t2_1024 where b1 > '0') or a2 < '9'; +-- echo +# The following two subqueries return the result of a string function with a +# blob argument, where the return type may be != blob. These are rejected during +# cost-based optimization when attempting to create a temporary table. +explain +select left(a1,7), left(a2,7) from t1_1024 where a1 in (select substring(b1,1,1024) from t2_1024 where b1 > '0') or a2 < '9'; +select left(a1,7), left(a2,7) from t1_1024 where a1 in (select substring(b1,1,1024) from t2_1024 where b1 > '0') or a2 < '9'; +explain +select left(a1,7), left(a2,7) from t1_1024 where (a1,a2) in (select substring(b1,1,1024), substring(b2,1,1024) from t2_1024 where b1 > '0') or a2 < '9'; +select left(a1,7), left(a2,7) from t1_1024 where (a1,a2) in (select substring(b1,1,1024), substring(b2,1,1024) from t2_1024 where b1 > '0') or a2 < '9'; +-- echo + + +-- echo +-- echo /* E. Edge cases. */ +-- echo + +-- echo /* E.1 Both materialization and in_to_exists cannot be off. */ +set @save_optimizer_switch=@@optimizer_switch; +set @@optimizer_switch = 'materialization=off,in_to_exists=off'; +--error ER_ILLEGAL_SUBQUERY_OPTIMIZER_SWITCHES +select * from t1 where a1 in (select b1 from t2 where b1 > '0' group by b1); +set @@optimizer_switch = @save_optimizer_switch; + +-- echo /* E.2 Outer query without tables, always uses IN-TO-EXISTS. */ +explain +select '1 - 03' in (select b1 from t2 where b1 > '0'); +select '1 - 03' in (select b1 from t2 where b1 > '0'); + +-- echo /* E.3 Subqueries without tables. */ +explain +select a1 from t1 where a1 in (select '1 - 03') or a2 < '9'; +select a1 from t1 where a1 in (select '1 - 03') or a2 < '9'; +-- echo UNION subqueries are currently limited to only use IN-TO-EXISTS. +explain +select a1 from t1 where a1 in (select '1 - 03' UNION select '1 - 02'); +select a1 from t1 where a1 in (select '1 - 03' UNION select '1 - 02'); + +-- echo /* E.4 optimize_cond detects FALSE where/having clause. */ +explain +select a1 from t1 where a1 in (select b1 from t2 where b1 = b2 and b2 = '1 - 03' and b1 = '1 - 02' ) or a2 < '9'; +select a1 from t1 where a1 in (select b1 from t2 where b1 = b2 and b2 = '1 - 03' and b1 = '1 - 02' ) or a2 < '9'; + +-- echo /* E.5 opt_sum_query detects no matching min/max row or substitutes MIN/MAX with a const. */ +-- echo TODO this test produces wrong result due to missing logic to handle the case +-- echo when JOIN::optimize detects an empty subquery result. +explain +select a1 from t1 where a1 in (select max(b1) from t2); +select a1 from t1 where a1 in (select max(b1) from t2); +-- echo +explain +select a1 from t1 where a1 in (select max(b1) from t2 where b1 = '7 - 02'); +select a1 from t1 where a1 in (select max(b1) from t2 where b1 = '7 - 02'); + +-- echo /* E.6 make_join_select detects impossible WHERE. * + +-- echo TODO + +-- echo /* E.7 constant optimization detects "no matching row in const table". */ + +-- echo TODO + +-- echo /* E.8 Impossible WHERE noticed after reading const tables. */ +explain +select '1 - 03' in (select b1 from t2 where b1 > '0' and b1 < '0'); +select '1 - 03' in (select b1 from t2 where b1 > '0' and b1 < '0'); + +-- echo +-- echo /* F. UPDATE/DELETE with subqueries. */ +-- echo + +-- echo TODO +-- echo |