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Fixed LP bug #664508.

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When join buffers are employed no index scan for the first
table with grouping columns can be used.



mysql-test/r/join_cache.result:
  Added a test case for bug #664508.
  Sorted results for some other test cases.
mysql-test/t/join_cache.test:
  Added a test case for bug #664508.
  Sorted results for some other test cases.
This commit is contained in:
Igor Babaev
2010-10-24 14:22:01 -07:00
parent de69dbae0c
commit 0c53cd1ec9
3 changed files with 227 additions and 82 deletions
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7
sql/sql_select.cc
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@@ -7980,8 +7980,11 @@ make_join_readinfo(JOIN *join, ulonglong options, uint no_jbuf_after)
JOIN_TAB *tab=join->join_tab+i;
if (tab->use_join_cache)
{
JOIN_TAB *sort_by_tab= join->get_sort_by_join_tab();
if (sort_by_tab && !join->need_tmp)
JOIN_TAB *sort_by_tab= join->group && join->simple_group &&
join->group_list ?
join->join_tab+join->const_tables :
join->get_sort_by_join_tab();
if (sort_by_tab)
{
join->need_tmp= 1;
join->simple_order= join->simple_group= 0;