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Support storing and exporting pandas extension types #18116

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@mroeschke mroeschke commented Feb 27, 2025 •
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Description

closes #14149

This PR allows our Python columns dtype attribute to hold a pandas extension type.

Additionally, to_pandas(nullable=, arrow_type=) keywords have been changed to no_default so in pandas_compatible mode, we will round trip the dtype we accepted from_pandas

This PR does not attempt to handle resolving a new data type if we were to operate on a column with a pandas extension type.

Checklist

  • I am familiar with the Contributing Guidelines.
  • New or existing tests cover these changes.
  • The documentation is up to date with these changes.

@mroeschke mroeschke added Python Affects Python cuDF API. improvement Improvement / enhancement to an existing function non-breaking Non-breaking change labels Feb 27, 2025
@mroeschke mroeschke self-assigned this Feb 27, 2025
@mroeschke mroeschke requested a review from a team as a code owner February 27, 2025 02:54
@mroeschke mroeschke requested review from wence- and Matt711 February 27, 2025 02:54
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@wence- wence- Awaiting requested review from wence- wence- is a code owner automatically assigned from rapidsai/cudf-python-codeowners

@Matt711 Matt711 Awaiting requested review from Matt711 Matt711 is a code owner automatically assigned from rapidsai/cudf-python-codeowners

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Labels
improvement Improvement / enhancement to an existing function non-breaking Non-breaking change Python Affects Python cuDF API.
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cuDF Python
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[FEA] Ability to round-trip all pandas columns dtypes
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