BUG: Fix ArrowDtype.itemsize for fixed-width types #62182
+29
−1
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doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.Fixes #57948
Summary
ArrowDtype.itemsize was incorrectly returning 8 bytes for date32[day] and other fixed-width PyArrow types because it always fell back to numpy_dtype.itemsize. This PR uses PyArrow's bit_width for fixed-width types and gracefully falls back to numpy for variable-width types.
Changes
Example
Before:
ArrowDtype(pa.date32()).itemsize == 8After:
ArrowDtype(pa.date32()).itemsize == 4