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BUG#21277: Wrong results in index_merge queries:

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Remove the code that cleared "read fields set" for merged scans. That code
was based on assumption that "We're going to just read rowids", while 
actually QUICK_RANGE_SELECT code would also need key part values to check 
that retrieved record(s) fall within the scanned intervals.
This commit is contained in:
sergefp@mysql.com
2006-08-21 17:03:07 +04:00
parent b2ce951b81
commit eefa3a6e94
3 changed files with 67 additions and 7 deletions
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7
sql/opt_range.cc
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@ -7584,16 +7584,10 @@ int QUICK_INDEX_MERGE_SELECT::read_keys_and_merge()
QUICK_RANGE_SELECT* cur_quick;
int result;
Unique *unique;
MY_BITMAP *save_read_set, *save_write_set;
handler *file= head->file;
DBUG_ENTER("QUICK_INDEX_MERGE_SELECT::read_keys_and_merge");
/* We're going to just read rowids. */
save_read_set= head->read_set;
save_write_set= head->write_set;
file->extra(HA_EXTRA_KEYREAD);
bitmap_clear_all(&head->tmp_set);
head->column_bitmaps_set(&head->tmp_set, &head->tmp_set);
head->prepare_for_position();
cur_quick_it.rewind();
@ -7658,7 +7652,6 @@ int QUICK_INDEX_MERGE_SELECT::read_keys_and_merge()
doing_pk_scan= FALSE;
/* index_merge currently doesn't support "using index" at all */
file->extra(HA_EXTRA_NO_KEYREAD);
head->column_bitmaps_set(save_read_set, save_write_set);
/* start table scan */
init_read_record(&read_record, thd, head, (SQL_SELECT*) 0, 1, 1);
DBUG_RETURN(result);