#31568: Alias used in aggregate filtering is incorrect
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Reporter: Gagaro | Owner: nobody
Type: Bug | Status: new
Component: Database | Version: 3.0
layer (models, ORM) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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With the following queryset:
{{{
IndicatorValue.objects
.values("freight")
.annotate(
loading_time=Min("datetime",
filter=Q(type=IndicatorValue.TYPE_FREIGHT_CREATED)) - Max("datetime",
filter=Q(type=IndicatorValue.TYPE_FREIGHT_COMPLETED)),
has_top_loading=Exists(OrderItemResult.objects.order_by().filter(order_line__order__freight=OuterRef("freight"),
loading_arm__loading_type=LoadingArm.LOADING_TYPE_TOP, ).values('pk')),
has_bottom_loading=Exists(OrderItemResult.objects.order_by().filter(order_line__order__freight=OuterRef("freight"),
loading_arm__loading_type=LoadingArm.LOADING_TYPE_BOTTOM, ).values('pk'))
)
.aggregate(
top_min=Min("loading_time", filter=Q(has_top_loading=True,
has_bottom_loading=False))
)
}}}
I get the following SQL generated for the aggregate (notice that both
alias used are the same in the SQL, whereas they are not in the queryset):
{{{
MIN("loading_time") FILTER (WHERE ("has_top_loading" = false AND
"has_top_loading" = true))
}}}
The full SQL generated is:
{{{
SELECT MIN("loading_time") FILTER (WHERE ("has_top_loading" = false AND
"has_top_loading" = true)) FROM (SELECT
"indicators_indicatorvalue"."freight_id" AS Col1,
(MIN("indicators_indicatorvalue"."datetime") FILTER (WHERE
"indicators_indicatorvalue"."type" = \'freight_created\') -
MAX("indicators_indicatorvalue"."datetime") FILTER (WHERE
"indicators_indicatorvalue"."type" = \'freight_completed\')) AS
"loading_time", EXISTS(SELECT U0."id" FROM "orders_orderitemresult" U0
INNER JOIN "loading_terminal_loadingarm" U1 ON (U0."loading_arm_id" =
U1."id") INNER JOIN "orders_orderitem" U2 ON (U0."order_line_id" =
U2."id") INNER JOIN "orders_order" U3 ON (U2."order_id" = U3."id") WHERE
(U1."loading_type" = \'TOP\' AND U3."freight_id" =
"indicators_indicatorvalue"."freight_id")) AS "has_top_loading",
EXISTS(SELECT U0."id" FROM "orders_orderitemresult" U0 INNER JOIN
"loading_terminal_loadingarm" U1 ON (U0."loading_arm_id" = U1."id") INNER
JOIN "orders_orderitem" U2 ON (U0."order_line_id" = U2."id") INNER JOIN
"orders_order" U3 ON (U2."order_id" = U3."id") WHERE (U1."loading_type" =
\'BOTTOM\' AND U3."freight_id" =
"indicators_indicatorvalue"."freight_id")) AS "has_bottom_loading" FROM
"indicators_indicatorvalue" WHERE "indicators_indicatorvalue"."deleted" IS
NULL GROUP BY "indicators_indicatorvalue"."freight_id", "has_top_loading",
"has_bottom_loading") subquery
}}}
It works fine with Django 2.2 (which does not use alias there if I'm not
mistaken).
--
Ticket URL: <https://code.djangoproject.com/ticket/31568>
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