Fix for BUG#14920 Ordering aggregated result sets corrupts resultset.

The cause of the bug was the use of end_write_group instead of end_write
in the case when ORDER BY required a temporary table, which didn't take
into account the fact that loose index scan already computes the result
of MIN/MAX aggregate functions (and performs grouping).

The solution is to call end_write instead of end_write_group and to add
the MIN/MAX functions to the list of regular functions so that their
values are inserted into the temporary table.


mysql-test/r/group_min_max.result:
  Test for BUG#14920
mysql-test/t/group_min_max.test:
  Test for BUG#14920
sql/sql_class.cc:
  Added new member to TMP_TABLE_PARAM.
sql/sql_class.h:
  Added new member to TMP_TABLE_PARAM.
sql/sql_select.cc:
  Enable result rows generated by loose index scan being written into
  a temporary table. The change is necessary because loose index
  scan already computes the result of GROUP BY and the MIN/MAX aggregate
  functions. This is realized by three changes:
  - create_tmp_table allocates space for aggregate functions in the
    list of regular functions,
  - use end_write instead of end_write group,
  - copy the pointers to the MIN/MAX aggregate functions to the list
    of regular functions TMP_TABLE_PARAM::items_to_copy.
sql/sql_select.h:
  New parameter to create_tmp_table.

1 files changed, 6 insertions, 0 deletions

diff --git a/sql/sql_select.h b/sql/sql_select.h
index 2f53c9a3b35..b3abd59f2b4 100644
--- a/sql/sql_select.h
+++ b/sql/sql_select.h
@@ -140,6 +140,12 @@ typedef struct st_join_table {
   nested_join_map embedding_map;
   
   void cleanup();
+  inline bool is_using_loose_index_scan()
+  {
+    return (select && select->quick &&
+            (select->quick->get_type() ==
+             QUICK_SELECT_I::QS_TYPE_GROUP_MIN_MAX));
+  }
 } JOIN_TAB;
 
 enum_nested_loop_state sub_select_cache(JOIN *join, JOIN_TAB *join_tab, bool