Code sample that demonstrates issues with chained filtering

repl-output.py

> from core.models import Application
> from django.db.models import Q
> test = Q(tags__name__startswith='a')
> # Below are two queries that are appear to be the same but are /very/ different
> print Application.objects.filter(test).filter(test).filter(test).query

    SELECT *
    FROM "application"
    INNER JOIN "application_tags" ON ( "application"."id" = " application_tags"."application_id")
    INNER JOIN "tag" ON ("application_tags"."tag_id" = "tag"."id")
    INNER JOIN "application_tags" T4 ON ("application"."id" = T4."application_id")
    INNER JOIN "tag" T5 ON (T4."tag_id" = T5."id")
    INNER JOIN "application_tags" T6 ON ("application"."id" = T6."application_id")
    INNER JOIN "tag" T7 ON (T6."tag_id" = T7."id")
    WHERE (
         "tag"."name"::TEXT LIKE a %
        AND T5."name"::TEXT LIKE a %
        AND T7."name"::TEXT LIKE a %
    )

> print Application.objects.filter(test & test & test).query

    SELECT *
    FROM "application"
    INNER JOIN "application_tags" ON ( "application"."id" = " application_tags"."application_id")
    INNER JOIN "tag" ON ("application_tags"."tag_id" = "tag"."id")
    WHERE (
            "tag"."name"::TEXT LIKE a %
        AND "tag"."name"::TEXT LIKE a %
        AND "tag"."name"::TEXT LIKE a %
    )