#34450: Lookup expressions across foreign keys introduce extra joins
-------------------------------------+-------------------------------------
Reporter: Roman Odaisky | Owner: Simon
| Charette
Type: Bug | Status: assigned
Component: Database layer | Version: 4.1
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by David Sanders):
Just FYI Simon's patch resolves the reported issue:
{{{
> print(Parent.objects.filter(Exact(F("child__x"), "x"),
child__y="y").query)
SELECT "ticket_34450_parent"."id" FROM "ticket_34450_parent" INNER JOIN
"ticket_34450_child" ON ("ticket_34450_parent"."id" =
"ticket_34450_child"."parent_id") WHERE ("ticket_34450_child"."x" = (x)
AND "ticket_34450_child"."y" = y)
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/34450#comment:11>
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