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Fix for MDEV-4219 A simple select query returns random data (upstream bug#68473)

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In the case of loose scan used as input for order by, end_send()
didn't detect correctly that a loose scan was used, and didn't copy
the non-aggregated fields from the temp table used for ORDER BY.
  
The fix uses the fact that the quick select used for sorting is
attached to JOIN::pre_sort_join_tab instead of JOIN::join_tab.
This commit is contained in:
unknown
2013-07-17 16:42:13 +03:00
parent a5b534a08e
commit 66ec79fc87
4 changed files with 101 additions and 2 deletions
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6
sql/opt_range.cc
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@ -13217,7 +13217,11 @@ QUICK_GROUP_MIN_MAX_SELECT::~QUICK_GROUP_MIN_MAX_SELECT()
DBUG_ASSERT(file == head->file);
if (doing_key_read)
head->disable_keyread();
file->ha_index_end();
/*
There may be a code path when the same table was first accessed by index,
then the index is closed, and the table is scanned (order by + loose scan).
*/
file->ha_index_or_rnd_end();
}
if (min_max_arg_part)
delete_dynamic(&min_max_ranges);