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[5.0.x] Fixed #34840 -- Avoided casting string base fields on PostgreSQL.

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Thanks Alex Vandiver for the report.

Regression in 09ffc5c121.

Backport of 779cd28acb from main.
This commit is contained in:
Mariusz Felisiak 2023-09-22 06:01:11 +02:00
parent fb5dd118e9
commit 2566f92544
6 changed files with 78 additions and 15 deletions
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10
docs/releases/4.2.6.txt
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@ -12,3 +12,13 @@ Bugfixes
* Fixed a regression in Django 4.2.5 where overriding the deprecated
``DEFAULT_FILE_STORAGE`` and ``STATICFILES_STORAGE`` settings in tests caused
the main ``STORAGES`` to mutate (:ticket:`34821`).
* Fixed a regression in Django 4.2 that caused unnecessary casting of string
based fields (``CharField``, ``EmailField``, ``TextField``, ``CICharField``,
``CIEmailField``, and ``CITextField``) used with the ``__isnull`` lookup on
PostgreSQL. As a consequence, the pre-Django 4.2 indexes didn't match and
were not used by the query planner (:ticket:`34840`).
You may need to recreate indexes propagated to the database with Django
4.2 - 4.2.5 as they contain unnecessary ``::text`` casting that is avoided as
of this release.