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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/cli.rst
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@ -2236,7 +2236,7 @@ The ``transform`` command allows you to apply complex transformations to a table
Every option for this table (with the exception of ``--pk-none``) can be specified multiple times. The options are as follows:
``--type column-name new-type``
Change the type of the specified column. Valid types are ``integer``, ``text``, ``float``, ``real``, ``blob`` and ``any``.
Change the type of the specified column. Valid types are ``integer``, ``text``, ``float``, ``real``, ``blob`` and ``any``. Changing a ``TEXT`` column to ``INTEGER``, ``FLOAT`` or ``REAL`` converts exact empty-string values to ``NULL``.
``--drop column-name``
Drop the specified column.