bug #25296 Truncate table converts NDB disk based tables to in-memory tables:...

bug #25296  Truncate table converts NDB disk based tables to in-memory tables: ha_ndbcluster::update_create_info should only update for TRUNCATE since we need to detect change of STORAGE at ALTER TABLE

sql/ha_ndbcluster.cc

@@ -8311,8 +8311,10 @@ ha_ndbcluster::setup_recattr(const NdbRecAttr* curr)
 
 void ha_ndbcluster::update_create_info(HA_CREATE_INFO *create_info)
 {
-  if (create_info->storage_media != HA_SM_MEMORY &&
-      get_tablespace_name(current_thd,0,0))
+  THD *thd= current_thd;
+
+  if (thd->lex->sql_command == SQLCOM_TRUNCATE &&
+      get_tablespace_name(thd,0,0))
     create_info->storage_media= HA_SM_DISK;
 }