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MDEV-24936 EXPLAIN for query based on table value constructor lacks info

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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>
This commit is contained in:
Igor Babaev
2021-02-21 22:01:24 -08:00
parent a49ce0bf93
commit a5b18613ec
3 changed files with 72 additions and 2 deletions
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25
mysql-test/main/table_value_constr.test
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@ -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