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Fixed bug #29911.

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This bug manifested itself for join queries with GROUP BY and HAVING clauses
whose SELECT lists contained DISTINCT. It occurred when the optimizer could
deduce that the result set would have not more than one row.
The bug could lead to wrong result sets for queries of this type because
HAVING conditions were erroneously ignored in some cases in the function
remove_duplicates.
This commit is contained in:
igor@olga.mysql.com
2007-07-20 22:56:19 -07:00
parent 91dc419715
commit 07e0cd2f4e
3 changed files with 46 additions and 1 deletions
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2
sql/sql_select.cc
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@ -8118,7 +8118,7 @@ remove_duplicates(JOIN *join, TABLE *entry,List<Item> &fields, Item *having)
field_count++;
}
if (!field_count && !(join->select_options & OPTION_FOUND_ROWS))
if (!field_count && !(join->select_options & OPTION_FOUND_ROWS) && !having)
{ // only const items with no OPTION_FOUND_ROWS
join->unit->select_limit_cnt= 1; // Only send first row
DBUG_RETURN(0);