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Fix bug #13855 select distinct with group by caused server crash

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DISTINCT wasn't optimized away and caused creation of tmp table in wrong
case. This result in integer overrun and running out of memory.

Fix backported from 4.1. Now if optimizer founds that in result be only 1
row it removes distinct.


sql/sql_select.cc:
  Fix bug #13855 select distinct with group by caused server crash
mysql-test/r/select.result:
  Test case for bug#13855 select distinct with group by caused server crash
mysql-test/t/select.test:
   Test case for bug#13855 select distinct with group by caused server crash
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unknown
2005-10-14 01:22:24 +04:00
parent f4e6fca1bd
commit 0390de8672
3 changed files with 18 additions and 0 deletions
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sql/sql_select.cc
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@@ -626,6 +626,7 @@ mysql_select(THD *thd,TABLE_LIST *tables,List<Item> &fields,COND *conds,
{
order=0; // The output has only one row
simple_order=1;
select_distinct= 0; // No need in distinct for 1 row
}
calc_group_buffer(&join,group);