MDEV-34636 Remove implementation of ha-spider::extra() with MERGE flags

storage/spider/ha_spider.cc

@@ -1223,7 +1223,6 @@ int ha_spider::reset()
 int ha_spider::extra(
   enum ha_extra_function operation
 ) {
-  int error_num;
   DBUG_ENTER("ha_spider::extra");
   DBUG_PRINT("info",("spider this=%p", this));
   DBUG_PRINT("info",("spider operation=%d", (int) operation));
@@ -1273,16 +1272,6 @@ int ha_spider::extra(
     case HA_EXTRA_INSERT_WITH_UPDATE:
       wide_handler->insert_with_update = TRUE;
       break;
-    case HA_EXTRA_ATTACH_CHILDREN:
-      DBUG_PRINT("info",("spider HA_EXTRA_ATTACH_CHILDREN"));
-      if (!(wide_handler->trx = spider_get_trx(ha_thd(), TRUE, &error_num)))
-        DBUG_RETURN(error_num);
-      break;
-    case HA_EXTRA_ADD_CHILDREN_LIST:
-      DBUG_PRINT("info",("spider HA_EXTRA_ADD_CHILDREN_LIST"));
-      if (!(wide_handler->trx = spider_get_trx(ha_thd(), TRUE, &error_num)))
-        DBUG_RETURN(error_num);
-      break;
     case HA_EXTRA_STARTING_ORDERED_INDEX_SCAN:
       DBUG_PRINT("info",("spider HA_EXTRA_STARTING_ORDERED_INDEX_SCAN"));
       if (table_share->primary_key != MAX_KEY)