#30158: Subquery Expressions Incorrectly Added to Group by
-------------------------------------+-------------------------------------
Reporter: JonnyWaffles | Owner: nobody
Type: Uncategorized | Status: closed
Component: Database layer | Version: 2.1
(models, ORM) |
Severity: Normal | Resolution: invalid
Keywords: subquery, group_by | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Simon Charette):
I suspect `Subquery.get_group_by_cols` needs to be adjusted to return an
empty list. Since #30099 (2.2a1+ only)
[https://github.com/django/django/blob/f021c110d02fd7ca32ae56f511b46e5d138b6c73/django/db/models/expressions.py#L334-L336
it returns] `[self]` but before this change [it returned all the filter
conditions with a left hand
side](https://github.com/django/django/blob/f021c110d02fd7ca32ae56f511b46e5d138b6c73/django/db/models/expressions.py#L1047-L1053)
which is even worst.
Could you try subclassing `Subquery` and overriding `get_group_by_cols` to
`return []`, use the subclass with your query, and see if it helps?
--
Ticket URL: <https://code.djangoproject.com/ticket/30158#comment:3>
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