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PERF: Use Arrow path in _factorize_keys for all Arrow Dtypes #63435

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PERF: Use Arrow path in _factorize_keys for all Arrow Dtypes #63435

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PERF: Use PyArrow dictionary_encode for all Arrow merge keys
fangchenli Dec 19, 2025
bdc18aa
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fangchenli Dec 21, 2025
86467f7
Merge remote-tracking branch 'upstream' into perf/merge-arrow-native
fangchenli Dec 21, 2025
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2 changes: 1 addition & 1 deletion pandas/core/reshape/merge.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2832,7 +2832,7 @@ def _factorize_keys(
rk = ensure_int64(rk.codes)

elif isinstance(lk, ExtensionArray) and lk.dtype == rk.dtype:
if (isinstance(lk.dtype, ArrowDtype) and is_string_dtype(lk.dtype)) or (
if isinstance(lk.dtype, ArrowDtype) or (
isinstance(lk.dtype, StringDtype) and lk.dtype.storage == "pyarrow"
):
import pyarrow as pa
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