BUG: Assigning pd.NA to StringDtype column causes "Unknown error: Wrapping .. failed" after pd.concat with PyArrow#64339
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kjmin622 wants to merge 5 commits intopandas-dev:mainfrom
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BUG: Assigning pd.NA to StringDtype column causes "Unknown error: Wrapping .. failed" after pd.concat with PyArrow#64339kjmin622 wants to merge 5 commits intopandas-dev:mainfrom
kjmin622 wants to merge 5 commits intopandas-dev:mainfrom
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…pping .. failed' after pd.concat with PyArrow
kjmin622
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Feb 27, 2026
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| # TODO: Remove this part when pa.if_else is fixed (GH#64320) | ||
| if isinstance(left, pa.ChunkedArray) and ( | ||
| pa.types.is_string(left.type) or pa.types.is_large_string(left.type) | ||
| ): | ||
| left = left.combine_chunks() | ||
|
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| if isinstance(right, pa.ChunkedArray) and ( | ||
| pa.types.is_string(right.type) or pa.types.is_large_string(right.type) | ||
| ): | ||
| right = right.combine_chunks() |
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PyArrow's pc.if_else misbehaves with chunked string arrays, causing PyArrow errors and data corruption; this fix call combine_chunks() on string/large_string ChunkedArrays in _if_else before invoking pc.if_else.
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doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.AGENTS.md.