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Bug #36011: server crash with explain extended on query

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with dependent subqueries
An IN subquery is executed on EXPLAIN when it's not correlated.
If the subquery required a temporary table for its execution
not all the internal structures were restored from pointing to
the items of the temporary table to point back to the items of
the subquery.
Fixed by restoring the ref array when a temp tables were used in
executing the IN subquery during EXPLAIN EXTENDED.
This commit is contained in:
gkodinov/kgeorge@magare.gmz
2008-05-16 17:05:55 +03:00
parent c86fc51e92
commit df3341a764
3 changed files with 31 additions and 4 deletions
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9
sql/sql_select.cc
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@ -2104,11 +2104,12 @@ JOIN::exec()
/*
With EXPLAIN EXTENDED we have to restore original ref_array
for a derived table which is always materialized.
Otherwise we would not be able to print the query correctly.
We also need to do this when we have temp table(s).
Otherwise we would not be able to print the query correctly.
*/
if (items0 &&
(thd->lex->describe & DESCRIBE_EXTENDED) &&
select_lex->linkage == DERIVED_TABLE_TYPE)
if (items0 && (thd->lex->describe & DESCRIBE_EXTENDED) &&
(select_lex->linkage == DERIVED_TABLE_TYPE ||
exec_tmp_table1 || exec_tmp_table2))
set_items_ref_array(items0);
DBUG_VOID_RETURN;