diff options
Diffstat (limited to 'sql/sql_update.cc')
| -rw-r--r-- | sql/sql_update.cc | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/sql/sql_update.cc b/sql/sql_update.cc index 24c7a278e79..48a8cf93917 100644 --- a/sql/sql_update.cc +++ b/sql/sql_update.cc @@ -212,7 +212,6 @@ int mysql_update(THD *thd, SORT_FIELD *sortorder; ha_rows examined_rows; - used_index= MAX_KEY; // For call to init_read_record() table->sort.io_cache = (IO_CACHE *) my_malloc(sizeof(IO_CACHE), MYF(MY_FAE | MY_ZEROFILL)); if (!(sortorder=make_unireg_sortorder(order, &length)) || @@ -244,7 +243,17 @@ int mysql_update(THD *thd, DISK_BUFFER_SIZE, MYF(MY_WME))) goto err; - if (used_index == MAX_KEY) + /* + When we get here, we have one of the following options: + A. used_index == MAX_KEY + This means we should use full table scan, and start it with + init_read_record call + B. used_index != MAX_KEY + B.1 quick select is used, start the scan with init_read_record + B.2 quick select is not used, this is full index scan (with LIMIT) + Full index scan must be started with init_read_record_idx + */ + if (used_index == MAX_KEY || (select && select->quick)) init_read_record(&info,thd,table,select,0,1); else init_read_record_idx(&info, thd, table, 1, used_index); |