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transform: coerce empty strings to NULL when converting TEXT columns to numeric types (#805)

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* transform: coerce empty strings to NULL when converting TEXT columns to numeric types

When a TEXT column is transformed to INTEGER, FLOAT, or REAL and a row
contains an empty string, the empty string is now converted to NULL during
the INSERT...SELECT copy, matching the expected behavior described in #488.

Fixes #488
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ikatyal2110 2026-08-13 14:56:51 -05:00 • committed by GitHub
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docs/python-api.rst
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@ -1826,6 +1826,8 @@ To alter the type of a column, use the ``types=`` argument:
# Convert the 'age' column to an integer, and 'weight' to a float
table.transform(types={"age": int, "weight": float})
When a ``TEXT`` column is changed to ``INTEGER``, ``FLOAT`` or ``REAL``, exact empty-string values are stored as ``NULL``. Other values, including whitespace-only strings, are copied normally.
See :ref:`python_api_add_column` for a list of available types.
.. _python_api_transform_strict: