fix build_minor_tables in rebuilding

src/sql/engine/expr/ob_expr_to_outfile_row.cpp

@@ -214,9 +214,9 @@ int ObExprToOutfileRow::extract_fisrt_wchar_from_varhcar(const ObObj &obj, int32
       ret = ObCharset::mb_wc(obj.get_collation_type(), str.ptr(), str.length(), length, wchar);
     }
   }
-  return ret;
-}
-
+  return ret;
+}
+
 // If the FIELDS ESCAPED BY character is not empty, it is used to prefix the following
 // characters on output:
 // 1. The FIELDS ESCAPED BY character.

src/storage/tablet/ob_tablet_table_store.cpp

@@ -790,7 +790,8 @@ int ObTabletTableStore::build_minor_tables(
             LOG_INFO("new sstable max merge trans version not equal to old sstable, "
                 "need add new sstable when table key is same", KPC(sstable), KPC(new_sstable));
           } else {
-            need_add = true; // just keep old sstable
+            ret = OB_NO_NEED_MERGE;
+            LOG_WARN("new table with old max merged trans version, no need to merge", K(ret), KPC(sstable), KPC(new_sstable));
           }
         } else if (ObTableStoreUtil::check_include_by_log_ts_range(*new_table, *table)) {
           LOG_DEBUG("table purged", K(*new_table), K(*table));