BUG: Preserve ExtensionDtype in DataFrame arithmetic with missing columns #63369
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…umns Fixes GH#63288
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Summary
Fixes a bug where DataFrame arithmetic with pyarrow-backed dtypes would convert missing columns to float64 with NaN instead of preserving the original ExtensionDtype with pd.NA.
Changes
Tests
test_arith_reindex_with_pyarrow_dtype
Thanks to @mattharrison, @jorisvandenbossche, and @jbrockmendel for the discussion and guidance.
Fixes #63288