TST: add regression test for apply case from GH-31605 #31621
Merged
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@jorisvandenbossche you wanted to put more tests in for this issue. I put the user reported code example into a test. Did you have anything else in mind? I didn't merge it with the above one since the above acted on an empty Dataframe.
black pandas
git diff upstream/master -u -- "*.py" | flake8 --diff