GH-49255: [Python] Fix pandas Categorical DeprecationWarnings in tests#50543
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Jul 18, 2026
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This seems good, I would add erroring on deprecation warning to pytest perhaps so we don't backslide.
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Yay, thanks for the contribution @GujaLomsadze! 🎉 |
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After merging your PR, Conbench analyzed the 4 benchmarking runs that have been run so far on merge-commit 59c3872. There were no benchmark performance regressions. 🎉 The full Conbench report has more details. It also includes information about 44 possible false positives for unstable benchmarks that are known to sometimes produce them. |
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Rationale for this change
pandas 3.0.0 deprecated constructing or casting to a
Categoricalwithnon-NA values that are not present in the specified
dtype.categories.This surfaces as DeprecationWarnings in the PyArrow
test suite when run against pandas >= 3.0 (GH-49255), in test_category
and test_category_implicit_from_pandas.
What changes are included in this PR?
cat_strings_with_nacolumn (relied onsilent 'qux' -> NaN; redundant, cat_strings already carries nulls).
(['a','b',None]) instead of out-of-category 'c'.
Are these changes tested?
Yes - test-only. Verified no DeprecationWarning under pandas 3.0.3.
Are there any user-facing changes?
No.
Closes #49255.