add ddl task status placeholder for fts index task

src/share/ob_ddl_common.h

@@ -165,6 +165,10 @@ enum ObDDLTaskStatus {
   WAIT_LOCAL_INDEX_SPLIT_END = 22,
   WAIT_LOB_TABLE_SPLIT_END = 23,
   WAIT_PARTITION_SPLIT_RECOVERY_TASK_FINISH = 24,
+  //GENERATE_ROWKEY_DOC_SCHEMA = 25,
+  //WAIT_ROWKEY_DOC_TABLE_COMPLEMENT = 26,
+  //GENERATE_DOC_AUX_SCHEMA = 27,
+  //WAIT_AUX_TABLE_COMPLEMENT = 28,
   FAIL = 99,
   SUCCESS = 100
 };