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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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@ -25,6 +25,7 @@ Unreleased
- ``sqlite-utils convert --dry-run`` now works for table and column names containing closing square brackets. (:issue:`829`)
- ``table.indexes`` and ``table.xindexes`` now work for table, index and column names containing double quotes. This also fixes ``table.transform()`` for tables with those identifiers. Thanks, `nyxst4ck <https://github.com/nyxst4ck>`__. (:issue:`824`, `#825 <https://github.com/simonw/sqlite-utils/pull/825>`__)
- Improved type annotations throughout the package and added Pyright regression checks to CI. (:issue:`833`)
- Changing a ``TEXT`` column to ``INTEGER``, ``FLOAT`` or ``REAL`` using ``table.transform()`` or ``sqlite-utils transform`` now converts exact empty strings to ``NULL``. Previously they remained empty strings in the numeric column. Thanks, `ikatyal2110 <https://github.com/ikatyal2110>`__. (:issue:`488`, `#805 <https://github.com/simonw/sqlite-utils/pull/805>`__)
.. _v3_39_1: