On Saturday, January 9, 2016 at 7:01:38 AM UTC+2, Curtis Maloney wrote:
>
> Hey all,
>
> I'm trying to write a PR for adding Postgres9.4's "FILTER" syntax for
> aggregates, but I've hit a bug I can't figure how to fix [and nobody's
> awake on IRC :)]
>
> https://github.com/django/django/pull/5956
>
> Basically, for the query:
>
> qset = FilterAggParentModel.objects.annotate(
> zero_count=FilterAgg(Count('filteraggtestmodel'),
> Q(filteraggtestmodel__integer_field=1)),
> child_count=Count('filteraggtestmodel'),
> )
>
> It generates the SQL:
>
> SELECT "postgres_tests_filteraggparentmodel"."id",
> COUNT("postgres_tests_filteraggtestmodel"."id") FILTER(WHERE
> "postgres_tests_filteraggtestmodel"."integer_field" = 0) AS "zero_count",
> COUNT("postgres_tests_filteraggtestmodel"."id") AS "child_count"
> FROM "postgres_tests_filteraggparentmodel"
> LEFT OUTER JOIN "postgres_tests_filteraggtestmodel" ON
> ("postgres_tests_filteraggparentmodel"."id" =
> "postgres_tests_filteraggtestmodel"."parent_id")
> GROUP BY "postgres_tests_filteraggparentmodel"."id",
> "postgres_tests_filteraggtestmodel"."integer_field"
>
>
> The problem being that
> "postgres_tests_filteraggtestmodel"."integer_field" is included in the
> GROUP BY clause...
>
> Does anyone who understands this part of the ORM have a suggestion for
> how to fix this?
>
If you don't return anything from get_group_by_cols() no part of the
expression should be added to the GROUP BY clause. I wonder why the
integer_field is added to the group by, a bug somewhere in compiler maybe?
- Anssi
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