Revert "fix: Allow consecutive calls to Table.group_by, closes #765"

CHANGELOG.rst

@@ -3,7 +3,6 @@ Unreleased
 
 * feat: Lowercase the ``null_values`` provided to individual data types, since all comparisons to ``null_values`` are case-insensitive. (#770)
 * feat: :class:`.Mean` works with :class:`.TimeDelta`. (#761)
-* fix: Allow consecutive calls to :meth:`.Table.group_by`. (#765)
 
 1.7.1 - Jan 4, 2023
 -------------------

agate/tableset/__init__.py

@@ -148,12 +148,7 @@ def _proxy(self, method_name, *args, **kwargs):
         tables = []
 
         for key, table in self.items():
-            result = getattr(table, method_name)(*args, **kwargs)
-            if isinstance(result, TableSet):
-                for table in result.values():
-                    tables.append(table)
-            else:
-                tables.append(result)
+            tables.append(getattr(table, method_name)(*args, **kwargs))
 
         return self._fork(
             tables,

tests/test_table/test_group_by.py

@@ -108,8 +108,3 @@ def test_group_by_bad_column(self):
 
         with self.assertRaises(KeyError):
             table.group_by('bad')
-
-    def test_group_by_twice(self):
-        table = Table(self.rows, self.column_names, self.column_types)
-
-        repr(table.group_by('one').group_by('two'))