Make code compatible with Python 3.8

Sergey Vasilyev · Sergey Vasilyev · commit 555f7a46293d · 2023-12-30T18:34:31.000+01:00
diff --git a/data_diff/diff_tables.py b/data_diff/diff_tables.py
@@ -262,7 +262,7 @@ def _validate_and_adjust_columns(self, table1: TableSegment, table2: TableSegmen
 
     def _diff_tables_root(
         self, table1: TableSegment, table2: TableSegment, info_tree: InfoTree
-    ) -> DiffResult | DiffResultList:
+    ) -> Union[DiffResult, DiffResultList]:
         return self._bisect_and_diff_tables(table1, table2, info_tree)
 
     @abstractmethod
