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[3.1.x] Fixed #31568 -- Fixed alias reference when aggregating over multiple subqueries.

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691def10a0 made all Subquery() instances
equal to each other which broke aggregation subquery pushdown which
relied on object equality to determine which alias it should select.

Subquery.__eq__() will be fixed in an another commit but
Query.rewrite_cols() should haved used object identity from the start.

Refs #30727, #30188.

Thanks Makina Corpus for the report.

Backport of adfbf653dc from master
This commit is contained in:
Simon Charette 2020-05-14 00:14:48 -04:00 • committed by Mariusz Felisiak
parent 8cb87a3f7c
commit 3913acdb29
3 changed files with 26 additions and 2 deletions
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3
docs/releases/3.0.7.txt
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@ -15,3 +15,6 @@ Bugfixes
* Fixed a regression in Django 3.0 where ``QuerySet.values()`` and
``values_list()`` crashed if a queryset contained an aggregation and a
subquery annotation (:ticket:`31566`).
* Fixed a regression in Django 3.0 where aggregates used wrong annotations when
a queryset has multiple subqueries annotations (:ticket:`31568`).