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With pandas 2, an ID column containing unused categories makes wide and dictionary inputs produce feature rows for IDs absent from the data. This can happen after filtering a categorical column.
Use
observed=Truewhen grouping these inputs so only IDs with observations are processed. Add extraction regressions covering wide, long and dictionary inputs, with and without sorting, while preserving the categorical index metadata.Validation: feature-extraction tests excluding Dask, Black and isort pass. Dask and the full dependency matrix were not run.
Prepared with AI assistance.