GH-49255: Fix pandas deprecation warnings in Categorical tests#49271
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shashbha14 wants to merge 1 commit intoapache:mainfrom
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GH-49255: Fix pandas deprecation warnings in Categorical tests#49271shashbha14 wants to merge 1 commit intoapache:mainfrom
shashbha14 wants to merge 1 commit intoapache:mainfrom
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Component: Python
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Feb 13, 2026
docs/source/python/ipc.rst
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@shashbha14 this is not related to Categorical tests. Would you like to update this PR?
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Thanks for catching that! I've removed the unrelated docs commit. The PR now only contains the pandas Categorical deprecation warnings fix.
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…H-49255) Replace pd.Categorical() calls that specify categories containing values not in the categories list with the recommended pattern: create the Categorical first, then use .set_categories() to restrict. Fixes deprecation warnings: - test_category: cat_strings_with_na - test_category_implicit_from_pandas: two Categorical instances Fixes apache#49255
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Fixes the pandas deprecation warnings we're seeing in the test suite.
What was happening
Pandas started warning when you create a
Categoricalwith values that aren't in the categories list. We had a few places in the tests doing this:test_category: Creatingcat_strings_with_nawith categories['foo', 'bar']but the data includes'qux'test_category_implicit_from_pandas: Two places creating Categoricals with['a', 'b', 'c']but only allowing['a', 'b']in categoriesWhat I changed
Instead of passing
categoriesdirectly topd.Categorical(), I:.set_categories()to restrict it to what we wantThis is the recommended way to do it and avoids the warnings.
Testing
Fixes #49255