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author | Igor Babaev <igor@askmonty.org> | 2021-02-21 22:01:24 -0800 |
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committer | Igor Babaev <igor@askmonty.org> | 2021-02-22 09:19:13 -0800 |
commit | a5b18613ec7966ff1aaa30fe0685fbd7fef8f7c9 (patch) | |
tree | ccf791fe733e976f93638c96d7c8721a181cc898 /mysql-test | |
parent | a49ce0bf9328e995f5a980d9de4e000f4164c077 (diff) | |
download | mariadb-git-a5b18613ec7966ff1aaa30fe0685fbd7fef8f7c9.tar.gz |
MDEV-24936 EXPLAIN for query based on table value constructor lacks info
on used subqueries
If a query was based on a table value constructor that contained subqueries
then EXPLAIN for such query did not contain any lines explaining the
execution plans of the subqueries.
This happened because
- no optimize() method was called for any subquery used by the table value
constructor when EXPLAIN command for the query was processed;
- EXPLAIN node created for the table value constructor itself did not
assume that some child nodes could be attached to it.
Approved by Oleksandr Byelkin <sanja@mariadb.com>
Diffstat (limited to 'mysql-test')
-rw-r--r-- | mysql-test/main/table_value_constr.result | 33 | ||||
-rw-r--r-- | mysql-test/main/table_value_constr.test | 25 |
2 files changed, 58 insertions, 0 deletions
diff --git a/mysql-test/main/table_value_constr.result b/mysql-test/main/table_value_constr.result index d7b32865db5..e112aca78af 100644 --- a/mysql-test/main/table_value_constr.result +++ b/mysql-test/main/table_value_constr.result @@ -2742,4 +2742,37 @@ NULL UNION RESULT <union4,5> ALL NULL NULL NULL NULL NULL NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where <nop>(<in_optimizer>(`test`.`t1`.`a`,<min>(/* select#4 */ select `tvc_0`.`7` from (values (7)) `tvc_0` union /* select#5 */ select `tvc_0`.`8` from (values (8)) `tvc_0`) <= <cache>(`test`.`t1`.`a`))) drop table t1; +# +# MDEV-24934:EXPLAIN for queries based on TVC using subqueries +# +create table t1 (a int); +insert into t1 values (3), (7), (1); +values (8), ((select * from t1 where a between 2 and 4)); +8 +8 +3 +explain values (8), ((select * from t1 where a between 2 and 4)); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used +2 SUBQUERY t1 ALL NULL NULL NULL NULL 3 Using where +values ((select * from t1 where a between 2 and 4)), +((select * from t1 where a > 10)); +(select * from t1 where a between 2 and 4) +3 +NULL +explain values ((select * from t1 where a between 2 and 4)), +((select * from t1 where a > 10)); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used +3 SUBQUERY t1 ALL NULL NULL NULL NULL 3 Using where +2 SUBQUERY t1 ALL NULL NULL NULL NULL 3 Using where +values (10,11), ((select * from t1 where a = 7) + 1, 21); +10 11 +10 11 +8 21 +explain values (10,11), ((select * from t1 where a = 7) + 1, 21); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used +2 SUBQUERY t1 ALL NULL NULL NULL NULL 3 Using where +drop table t1; End of 10.3 tests diff --git a/mysql-test/main/table_value_constr.test b/mysql-test/main/table_value_constr.test index bac85ff75cc..0a78fd9b386 100644 --- a/mysql-test/main/table_value_constr.test +++ b/mysql-test/main/table_value_constr.test @@ -1434,4 +1434,29 @@ eval explain extended $q; drop table t1; +--echo # +--echo # MDEV-24934:EXPLAIN for queries based on TVC using subqueries +--echo # + +create table t1 (a int); +insert into t1 values (3), (7), (1); + +let $q1= +values (8), ((select * from t1 where a between 2 and 4)); +eval $q1; +eval explain $q1; + +let $q2= +values ((select * from t1 where a between 2 and 4)), + ((select * from t1 where a > 10)); +eval $q2; +eval explain $q2; + +let $q3= +values (10,11), ((select * from t1 where a = 7) + 1, 21); +eval $q3; +eval explain $q3; + +drop table t1; + --echo End of 10.3 tests |