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MDEV-16088: Pushdown into materialized views/derived tables doesn't

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work in the IN subqueries

The pushdown into the materialized derived table/view wasn't done because
optimize() for the derived was called before any conditions that can
be pushed down were extracted. So optimize() in
convert_join_subqueries_to_semijoins() method is called too early and is
unnecessary. The second optimize() call in mysql_handle_single_derived()
is enough.
This commit is contained in:
Galina Shalygina
2018-05-10 23:01:41 +02:00
parent 77867c147b
commit 8b26fea835
5 changed files with 500 additions and 6 deletions
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2
sql/opt_subselect.cc
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@@ -1092,8 +1092,6 @@ bool convert_join_subqueries_to_semijoins(JOIN *join)
while ((in_subq= li++))
{
SELECT_LEX *subq_sel= in_subq->get_select_lex();
if (subq_sel->handle_derived(thd->lex, DT_OPTIMIZE))
DBUG_RETURN(1);
if (subq_sel->handle_derived(thd->lex, DT_MERGE))
DBUG_RETURN(TRUE);
subq_sel->update_used_tables();