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Fixed bug mdev-4418.

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After single row substitutions there might appear new equalities.
They should be properly propagated to all AND/OR levels the WHERE
condition. It's done now with an additional call of remove_eq_conds().
This commit is contained in:
Igor Babaev
2013-08-16 22:01:47 -07:00
parent 752d5d022d
commit 25c152018d
14 changed files with 98 additions and 10 deletions
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17
sql/sql_select.cc
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@@ -1210,6 +1210,23 @@ JOIN::optimize()
/* Handle the case where we have an OUTER JOIN without a WHERE */
conds=new Item_int((longlong) 1,1); // Always true
}
if (const_tables && conds)
{
conds= remove_eq_conds(thd, conds, &cond_value);
if (cond_value == Item::COND_FALSE)
{
zero_result_cause=
"Impossible WHERE noticed after reading const tables";
select_lex->mark_const_derived(zero_result_cause);
if (select_options & SELECT_DESCRIBE)
{
conds=new Item_int((longlong) 0,1);
}
goto setup_subq_exit;
}
}
select= make_select(*table, const_table_map,
const_table_map, conds, 1, &error);
if (error)