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Bug#54416 MAX from JOIN with HAVING returning NULL with 5.1 and Empty set

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The problem there is that HAVING condition evaluates const
parts of condition despite the condition has references
on aggregate functions. Table t1 became const tables
after make_join_statistics and table1.pk = 1, HAVING is
transformed into MAX(1) < 7 and taken away from HAVING.
The fix is to skip evaluation of HAVING conts parts if
HAVING condition has references on aggregate functions.
This commit is contained in:
Sergey Glukhov
2010-07-09 14:39:47 +04:00
parent b440125f1c
commit 3c39a56208
3 changed files with 38 additions and 1 deletions
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2
sql/sql_select.cc
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@ -1132,7 +1132,7 @@ JOIN::optimize()
elements may be lost during further having
condition transformation in JOIN::exec.
*/
if (having && const_table_map)
if (having && const_table_map && !having->with_sum_func)
{
having->update_used_tables();
having= remove_eq_conds(thd, having, &having_value);