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[Python] Keep the Series name in DataFrame Series.agg with a list #40573

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Merged
claudevdm merged 1 commit into from
Oct 14, 2026
Merged

[Python] Keep the Series name in DataFrame Series.agg with a list #40573

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4 changes: 3 additions & 1 deletion sdks/python/apache_beam/dataframe/frames.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2057,11 +2057,13 @@ def aggregate(self, func, axis, *args, **kwargs):
if base_func in HAND_IMPLEMENTED_GLOBAL_AGGREGATIONS:
result = getattr(self, base_func)(*args, **kwargs)
if isinstance(func, list):
name = self._expr.proxy().name
with expressions.allow_non_parallel_operations(True):
return frame_base.DeferredFrame.wrap(
expressions.ComputedExpression(
f'wrap_aggregate_{base_func}',
lambda x: pd.Series(x, index=[base_func]), [result._expr],
lambda x: pd.Series(x, index=[base_func], name=name),
[result._expr],
requires_partition_by=partitionings.Singleton(),
preserves_partition_by=partitionings.Singleton()))
else:
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6 changes: 6 additions & 0 deletions sdks/python/apache_beam/dataframe/frames_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2190,6 +2190,12 @@ def test_series_agg_modes(self):
self._run_test(lambda s: s.agg(['mean']), s)
self._run_test(lambda s: s.agg('mean'), s)

def test_series_agg_list_keeps_name(self):
s = pd.Series(list(range(16)), name='x')
self._run_test(lambda s: s.agg(['mean']), s)
self._run_test(lambda s: s.agg(['sum', 'mean']), s)
self._run_test(lambda s: s.agg(['std', 'var']), s)

def test_dataframe_agg_modes(self):
df = pd.DataFrame({'A': [1, 2, 3, 4], 'B': [2, 3, 5, 7]})
self._run_test(lambda df: df.agg('sum'), df)
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