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Fix groupby.apply columns axis name for row-like UDF results #22809

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Merged
rapids-bot merged 4 commits into from
Jun 10, 2026
Merged

Fix groupby.apply columns axis name for row-like UDF results #22809

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9d881bc
fix
galipremsagar Jun 8, 2026
2048577
Merge branch 'main' into gb_fix_5
galipremsagar Jun 8, 2026
25da5e4
Merge branch 'main' into gb_fix_5
galipremsagar Jun 9, 2026
8825b7b
Merge branch 'main' into gb_fix_5
galipremsagar Jun 9, 2026
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7 changes: 7 additions & 0 deletions python/cudf/cudf/core/groupby/groupby.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2145,6 +2145,13 @@ def _post_process_chunk_results(
result = concat(chunk_results, axis=1).T
result.index = group_names
result.index.names = self.grouping.names
# pandas names the columns axis after the row-like Series
# returned by the UDF (e.g. ``iloc[0]`` carries the original
# row label as its name); ``concat(..., axis=1).T`` otherwise
# drops it, leaving an unnamed columns axis.
result.columns = result.columns.set_names(
[chunk_results[0].name]
)
# When the UDF is like df.x + df.y, the result for each
# group is the same length as the original group
elif (total_rows := sum(len(chk) for chk in chunk_results)) in {
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50 changes: 0 additions & 50 deletions python/cudf/cudf/pandas/scripts/pandas-testing-plugin.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2201,56 +2201,6 @@ def pytest_unconfigure(config):
"tests/groupby/aggregate/test_aggregate.py::test_agg_str_with_kwarg_axis_1_raises[max]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_agg_str_with_kwarg_axis_1_raises[min]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_agg_str_with_kwarg_axis_1_raises[nunique]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-bool-bool-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-bool-bool-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-bool-float32-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-bool-float32-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-bool-float64-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-bool-float64-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-bool-int32-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-bool-int32-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-bool-int64-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-bool-int64-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float32-bool-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float32-bool-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float32-float32-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float32-float32-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float32-float64-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float32-float64-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float32-int32-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float32-int32-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float32-int64-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float32-int64-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float64-bool-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float64-bool-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float64-float32-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float64-float32-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float64-float64-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float64-float64-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float64-int32-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float64-int32-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float64-int64-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-float64-int64-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int32-bool-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int32-bool-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int32-float32-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int32-float32-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int32-float64-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int32-float64-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int32-int32-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int32-int32-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int32-int64-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int32-int64-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int64-bool-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int64-bool-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int64-float32-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int64-float32-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int64-float64-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int64-float64-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int64-int32-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int64-int32-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int64-int64-keys0-agg_index0]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_callable_result_dtype_frame[apply-int64-int64-keys1-agg_index1]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_groupby_aggregate_directory[size]": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_groupby_aggregate_empty_key_empty_return": "TODO: Add a reason for failure",
"tests/groupby/aggregate/test_aggregate.py::test_groupby_aggregate_empty_with_multiindex_frame": "AssertionError: DataFrame.index level [0] are different",
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