BUG: Fix bug in reindexing of period columns after unstack #61114
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mroeschke
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mroeschke
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Mar 17, 2025
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Thanks @snitish |
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doc/source/whatsnew/v3.0.0.rstfile if fixing a bug or adding a new feature.When indexing a
Periodblock, theBaseBlockManager.reindex_indexermethod thinksPeriodblocks can't store 2D values and always returns the first element. This is because it uses a hardcoded list of types (which is missingPeriodDtype) that are known to allow 2D values. The fix is to use theis_1d_only_ea_dtypeutility function which internally uses the_supports_2dflag of the dtype.The bug only happens when indexing a 2D period block, which may be created after operations like transpose, pivot, unstack etc.