API: integer Extension Array · Issue #20700 · pandas-dev/pandas (original) (raw)

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Description

xref #8640

Could easily imagine an ExtensionArray which uses as an implementation a numpy array of the appropriate dtype and a bitmask in order to fully support Integer NA across the board. I don't think this would be too hard. As a bonus, would be zero-copy compat with pyarrow impl (for the future)

• Integer (ENH: Integer NA Extension Array #21160)
• UnsignedInteger (ENH: Integer NA Extension Array #21160)
• Boolean (API: boolean Extension Array #21778)

making these the actual default (e.g. when integers are inferred with or w/o nulls) might be non-trivial, but let's implement first. These would give rise to a hierarchy of dtypes, e.g. IntegerDtype, Int8Dtype