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Preserve column before/after comments through .transform()

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Refs #762

The before comment comes before the column definition - the after
comment is anything after it but before its trailing comma.
This commit is contained in:
Simon Willison 2026-08-11 22:37:13 -07:00
commit 36e36dcd3f
6 changed files with 171 additions and 18 deletions
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docs/python-api.rst
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@ -1995,6 +1995,8 @@ CHECK constraints
A column-level check is removed if its owning column is dropped. Dropping a column referenced by any remaining check raises ``TransformError`` instead of creating an invalid or unexpectedly weakened schema.
Comments immediately before or after a column definition are preserved too. They move with that column if it is renamed or reordered, and are removed if the column is dropped. A comment between two column definitions is treated as belonging to the following column.
.. _python_api_transform_views:
Tables referenced by views