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fix: nameless column to_frame bug for pandas 3.0 #17371

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Merged
shuoweil merged 2 commits into from
Jun 5, 2026
+7 −4
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fix: nameless column to_frame bug for pandas 3.0 #17371

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583ef5b
fix: nameless column to_frame bug for pandas 3.0
shuoweil Jun 3, 2026
249e463
Update packages/bigframes/bigframes/series.py
shuoweil Jun 3, 2026
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11 changes: 7 additions & 4 deletions packages/bigframes/bigframes/series.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2280,11 +2280,14 @@ def mask(self, cond, other=None) -> Series:
return self.where(~cond, other)

def to_frame(self, name: blocks.Label = None) -> bigframes.dataframe.DataFrame:
provided_name = name if name else self.name
provided_name = name if name is not None else self.name
# To be consistent with Pandas, it assigns 0 as the column name if missing. 0 is the first element of RangeIndex.
block = self._block.with_column_labels(
[provided_name] if provided_name else [0]
)
column_names: List[blocks.Label]
if provided_name is None or pandas.isna([cast(Any, provided_name)])[0]:
column_names = [0]
else:
column_names = [provided_name]
block = self._block.with_column_labels(column_names)
return bigframes.dataframe.DataFrame(block)

def to_csv(
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