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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