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MDEV-17017 Explain for query using derived table specified with

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a table value constructor shows wrong number of rows

This is another attempt to fix this bug. The previous patch did not take
into account that a transformation for ALL/ANY subqueries could be applied
to the materialized table that wrapped the table value constructor used as
a specification of the subselect used an ALL/ANY subquery. In this case
the result of the derived table used a sink of the class select_subselect
rather than of the class select_unit. Thus the previous fix could cause
memory overwrites when running EXPLAIN for queries with table value
constructors in ALL/ANY subselects.
This commit is contained in:
Igor Babaev
2018-08-27 08:12:59 -07:00
parent a290b807e8
commit 497d86276f
4 changed files with 6 additions and 9 deletions
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mysql-test/main/table_value_constr.test
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@ -1123,5 +1123,3 @@ PREPARE stmt FROM "SELECT * FROM (VALUES(1 + 1,2,'abc')) t";
EXECUTE stmt;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;