TST: Add regression test for MultiIndex merge after reset_index #63256
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- Add test for GH#62150 - Bug was present in 2.3.1, fixed in 3.0.0 - Test ensures merge works when one df has single-level index and other has multi-level index after reset_index() Closes pandas-dev#62150
mroeschke
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Dec 4, 2025
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| # GH#62150 - merging reset MultiIndex when one df has single-level index | ||
| # Bug existed in 2.3.1, fixed in 3.0.0, this test prevents regression |
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Can you remove all the comments (and the comments below) except GH#62150?
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| df = DataFrame(data={("column_1", ""): [1, 1], ("column_2", ""): [2, 2]}) | ||
| df.index = MultiIndex.from_arrays( | ||
| [[1, 1], ["metadata_1", "metadata_2"]], names=["index", "metadata"] | ||
| ) | ||
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| # Create second dataframe with single index and MultiIndex columns | ||
| df2 = DataFrame(data=[1, 1], index=[1, 1]).rename_axis("index", axis=0) | ||
| df2.columns = MultiIndex.from_product([["new_data"], [""]]) |
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As mentioned in #62150 (comment), it would be good to construct these DataFrames directly
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Closes #62150
doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.AGENTS.md.