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DOC: Add documentation on parquet categorical data handling #58245

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Apr 19, 2024
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DOC: Add documentation on parquet categorical data handling #58245

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13 changes: 10 additions & 3 deletions pandas/core/frame.py
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Expand Up @@ -2877,9 +2877,16 @@ def to_parquet(

Notes
-----
This function requires either the `fastparquet
<https://pypi.org/project/fastparquet>`_ or `pyarrow
<https://arrow.apache.org/docs/python/>`_ library.
* This function requires either the `fastparquet
<https://pypi.org/project/fastparquet>`_ or `pyarrow
<https://arrow.apache.org/docs/python/>`_ library.
* When saving a DataFrame with categorical columns to parquet,
the file size may increase due to the inclusion of all possible
categories, not just those present in the data. This behavior
is expected and consistent with pandas' handling of categorical data.
To manage file size and ensure a more predictable roundtrip process,
consider using :meth:`Categorical.remove_unused_categories` on the
DataFrame before saving.

Examples
--------
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