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BUG#49902 - SELECT returns incorrect results

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Queries optimized with GROUP_MIN_MAX didn't cleanup KEYREAD
optimization properly. As a result subsequent queries may
return incomplete rows (fields are initialized to default
values).
This commit is contained in:
Sergey Vojtovich
2010-02-09 12:53:13 +04:00
parent 73cfad9ff4
commit 06fb46a029
8 changed files with 62 additions and 87 deletions
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15
sql/opt_range.cc
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@ -1171,11 +1171,7 @@ QUICK_RANGE_SELECT::~QUICK_RANGE_SELECT()
if (file)
{
range_end();
if (head->key_read)
{
head->key_read= 0;
file->extra(HA_EXTRA_NO_KEYREAD);
}
head->set_keyread(FALSE);
if (free_file)
{
DBUG_PRINT("info", ("Freeing separate handler 0x%lx (free: %d)", (long) file,
@ -1377,10 +1373,7 @@ end:
head->file= file;
/* We don't have to set 'head->keyread' here as the 'file' is unique */
if (!head->no_keyread)
{
head->key_read= 1;
head->mark_columns_used_by_index(index);
}
head->prepare_for_position();
head->file= org_file;
bitmap_copy(&column_bitmap, head->read_set);
@ -8165,7 +8158,7 @@ int QUICK_INDEX_MERGE_SELECT::read_keys_and_merge()
DBUG_ENTER("QUICK_INDEX_MERGE_SELECT::read_keys_and_merge");
/* We're going to just read rowids. */
file->extra(HA_EXTRA_KEYREAD);
head->set_keyread(TRUE);
head->prepare_for_position();
cur_quick_it.rewind();
@ -8241,7 +8234,7 @@ int QUICK_INDEX_MERGE_SELECT::read_keys_and_merge()
delete unique;
doing_pk_scan= FALSE;
/* index_merge currently doesn't support "using index" at all */
file->extra(HA_EXTRA_NO_KEYREAD);
head->set_keyread(FALSE);
init_read_record(&read_record, thd, head, (SQL_SELECT*) 0, 1 , 1, TRUE);
DBUG_RETURN(result);
}
@ -10628,7 +10621,7 @@ int QUICK_GROUP_MIN_MAX_SELECT::reset(void)
int result;
DBUG_ENTER("QUICK_GROUP_MIN_MAX_SELECT::reset");
file->extra(HA_EXTRA_KEYREAD); /* We need only the key attributes */
head->set_keyread(TRUE); /* We need only the key attributes */
if ((result= file->ha_index_init(index,1)))
DBUG_RETURN(result);
if (quick_prefix_select && quick_prefix_select->reset())