id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
26045	Annotate with conditional aggregation includes non-relevant fields in GROUP BY clause	mark88	nobody	"I'm using Django 1.8.6 and conditional aggregates.


{{{
objects = self.get_queryset().annotate(sent_count=
        Sum(
            Case(When(messages__date_sent__gte=date_from, then=1)),
            output_field=IntegerField()
        ),
        error_count=
        Sum(
            Case(When(messages__status__iexact='error', then=1)),
            output_field=IntegerField()
        ),
        sent_yesterday=
        Sum(
            Case(When(messages__date_sent__gte=yesterday, then=1)),
            output_field=IntegerField()
        )
    )
}}}

And when viewing SQL query for this annotation, I see every single field in this model is included in GROUP BY clause, making query very slow. There's also one field from related model included in GROUP BY. I've run the query manually, removing all unnecessary fields from the clause and it runs fine"	Bug	closed	Database layer (models, ORM)	1.8	Normal	needsinfo	orm, sql, annotation		Unreviewed	0	0	0	0	0	0