#34978: Annotating through an aggregate with RawSQL() raises 1056 "Can't group
on"
on MySQL/MariaDB.
-------------------------------------+-------------------------------------
Reporter: Matthew Somerville | Owner: Simon
| Charette
Type: Bug | Status: assigned
Component: Database layer | Version: 4.2
(models, ORM) |
Severity: Release blocker | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Natalia Bidart):
Replying to [comment:4 Simon Charette]:
> I could see us go three ways about dealing with this issue
>
> 1. Revert the changes made in 041551d716b69ee7c81199eee86a2d10a72e15ab
while making `allows_group_by_pk` based on the absence of
`ONLY_FULL_GROUP_BY`. Note that this won't resolve the aggregation over
the annotation of a dependant subquery but will restore the usage of
`RawSQL` for aggregation on MySQL only when `ONLY_FULL_GROUP_BY` is
disabled.
> 2. 1 + adjustments to the `allows_group_by_pk` to special case dependant
subquery annotations
> 3. Adjust the 4.2 existing release notes about this change to better
communicate that this version of Django removed support for doing `RawSQL`
aggregations on MySQL and that they should use proper expressions instead
going forward.
Given your rationale and considering that there are multiple workarounds
as you proposed, I'm also in favor of option 3.
--
Ticket URL: <https://code.djangoproject.com/ticket/34978#comment:5>
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