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Fix for bug#49570: Assertion failed: !(order->used & map)

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on re-execution of prepared statement

Problem: some (see eq_ref_table()) ORDER BY/GROUP BY optimization
is called before each PS execution. However, we don't properly 
initialize its stucture every time before the call.

Fix: properly initialize the sturture used.
This commit is contained in:
Ramil Kalimullin
2009-12-22 10:39:29 +04:00
parent 27c0939846
commit ee403cc1a2
3 changed files with 39 additions and 0 deletions
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sql/sql_select.cc
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@ -6777,6 +6777,7 @@ static void update_depend_map(JOIN *join, ORDER *order)
table_map depend_map;
order->item[0]->update_used_tables();
order->depend_map=depend_map=order->item[0]->used_tables();
order->used= 0;
// Not item_sum(), RAND() and no reference to table outside of sub select
if (!(order->depend_map & (OUTER_REF_TABLE_BIT | RAND_TABLE_BIT))
&& !order->item[0]->with_sum_func)