[Fix] check data completement task before execute inner sql and kill session when task is cancel

src/share/ob_debug_sync_point.h

@@ -425,6 +425,7 @@ class ObString;
     ACT(BEFORE_TABLE_REDEFINITION_TASK_EFFECT,)\
     ACT(ALTER_LS_CHOOSE_SRC,)\
     ACT(BEFORE_LOCK_SERVICE_UNLOCK,)\
+    ACT(DDL_CHECK_TABLET_MERGE_STATUS,)\
     ACT(MAX_DEBUG_SYNC_POINT,)
 
 DECLARE_ENUM(ObDebugSyncPoint, debug_sync_point, OB_DEBUG_SYNC_POINT_DEF);