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

storage/spider/ha_spider.cc

@@ -1376,7 +1376,6 @@ 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));
@@ -1428,16 +1427,6 @@ int ha_spider::extra(
       wide_handler->insert_with_update = TRUE;
       break;
 #endif
-    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;
 #if defined(HA_EXTRA_HAS_STARTING_ORDERED_INDEX_SCAN) || defined(HA_EXTRA_HAS_HA_EXTRA_USE_CMP_REF)
 #ifdef HA_EXTRA_HAS_STARTING_ORDERED_INDEX_SCAN
     case HA_EXTRA_STARTING_ORDERED_INDEX_SCAN: