subject:"\[Django\] #30209\: Union with group by don't generate correct Subquery"

Re: [Django] #30209: Union with group by don't generate correct Subquery

2022-01-25 Thread Django

#30209: Union with group by don't generate correct Subquery
-+-
 Reporter:  Nikolas  |Owner:  Can
 |  Sarıgöl
 Type:  Bug  |   Status:  closed
Component:  Database layer   |  Version:  dev
  (models, ORM)  |
 Severity:  Normal   |   Resolution:  duplicate
 Keywords:  union, group by  | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  1
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by Mariusz Felisiak):

 * status:  assigned => closed
 * resolution:   => duplicate


Comment:

 A proper exception when calling `annotate()` after `union()`,
 `intersection()`, and `difference()` was added in
 1853383969a4c53bbeba998757c30410bd3df4bb.

 Closing as a duplicate of #28519.

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Re: [Django] #30209: Union with group by don't generate correct Subquery

2020-06-04 Thread Django

Comment (by felixxm):

Replying to [comment:12 Matthijs Kooijman]:
> It seems the linked PR was already closed, so it seems implementing this
properly has been abandoned?
>
> As for showing a warning when a union is annotated with an aggregation,
it seems that https://github.com/django/django/pull/11591 forbids *all*
annotations on unions, so this case seems to be convered by that as well.
Not sure what that means for the status of this ticket, though.

I opened a [https://github.com/django/django/pull/11692 new PR] but it's
still WIP. There is a tricky parentheses issue on MySQL/MariaDB. I hope I
will find time to finish it.

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Re: [Django] #30209: Union with group by don't generate correct Subquery

2020-06-04 Thread Django

#30209: Union with group by don't generate correct Subquery
-+-
 Reporter:  Nikolas  |Owner:  Can
 |  Sarıgöl
 Type:  Bug  |   Status:  assigned
Component:  Database layer   |  Version:  master
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  union, group by  | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  1
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-

Comment (by Matthijs Kooijman):

 It seems the linked PR was already closed, so it seems implementing this
 properly has been abandoned?

 As for showing a warning when a union is annotated with an aggregation, it
 seems that https://github.com/django/django/pull/11591 forbids *all*
 annotations on unions, so this case seems to be convered by that as well.
 Not sure what that means for the status of this ticket, though.

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Re: [Django] #30209: Union with group by don't generate correct Subquery

2019-04-16 Thread Django

#30209: Union with group by don't generate correct Subquery
-+-
 Reporter:  Nikolas  |Owner:  Can
 |  Sarıgöl
 Type:  Bug  |   Status:  assigned
Component:  Database layer   |  Version:  master
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  union, group by  | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  1
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by Can Sarıgöl):

 * status:  new => assigned
 * owner:  nobody => Can Sarıgöl


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Re: [Django] #30209: Union with group by don't generate correct Subquery

2019-04-03 Thread Django

#30209: Union with group by don't generate correct Subquery
-+-
 Reporter:  Nikolas  |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Database layer   |  Version:  master
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  union, group by  | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  1
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by Can Sarıgöl):

 * cc: Can Sarıgöl (added)
 * has_patch:  0 => 1


Comment:

 Hi, I've been tackling "union as a subquery" topic for a while. So I tried
 to fix, could you review? Thanks.
 [https://github.com/django/django/pull/11167 PR]

 Mentioned [https://github.com/django/django/pull/11152 PR]

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Re: [Django] #30209: Union with group by don't generate correct Subquery

2019-03-21 Thread Django

#30209: Union with group by don't generate correct Subquery
-+-
 Reporter:  Nikolas  |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Database layer   |  Version:  master
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  union, group by  | Triage Stage:  Accepted
Has patch:  0|  Needs documentation:  1
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-

Comment (by TKdka):

 Replying to [comment:8 Simon Charette]:
 > > I'm not sure what exception class should be used here. TypeError?
 Thoughts?
 >
 > Good question. I know that
 [https://docs.djangoproject.com/en/2.1/ref/models/querysets/#union we're
 currently preventing some operations on combined querysets] so I'd try to
 see what type of exception we're currently raising and stick to it to be
 coherent. I think `.filter()` is disallowed for example. It's possible
 that we simply crash though.
 >
 > I think the best place to add this check would be in
 `query.Queryset.annotate` just before `set_group_by`
 
[https://github.com/django/django/blob/418263c457636d3301f2068c47f09a0f42e15c52/django/db/models/query.py#L1052
 is called] if an annotation contains aggregates.

 On where the exception should be raised...
 I agree with general placement, but I'm thinking the exception should be
 raised as soon as an aggregate function as noticed, so just after
 
[https://github.com/django/django/blob/418263c457636d3301f2068c47f09a0f42e15c52/django/db/models/query.py#L1048
 line 1048 is called]   The other part of the conditional,
 {{{
 clone.query.group_by = True
 }}}
 is problematic as well.  This appears to create a group by over all the
 fields, which is not supported.  Thoughts?


 On the type of exception that should be raised...
 Using union+filter does not raise an exception (nor does it work).  I
 think that the correct exception should be something along the lines of a
 SQLNotSupported exception.  The exception should state what SQL feature
 combination is not supported and then suggest using a raw query or
 rewriting the query.   Is there already something like this?


 On related bugs...
 I found two similar bugs while exploring this feature (one of which is
 mentioned above).  I'll create tickets for them as well, but wanted to
 mention them here too.

 As mentioned above, there is a bug with filter + union as well.
 Performing a filter with a union neither raises an exception nor adds the
 filter.
  {{{
 qs1 = Book.objects.filter(pk__lte=10)
 qs2 = Book.objects.filter(pk__gt=10)
 qs3 = qs1.union(qs2)
 qs4  = qs3.filter(publisher_id=1)
 print (qs4.query)
 }}}
 SELECT "aggregation_book"."id", "aggregation_book"."isbn",
 "aggregation_book"."name", "aggregation_book"."pages",
 "aggregation_book"."rating", "aggregation_book"."price",
 "aggregation_book"."contact_id", "aggregation_book"."publisher_id",
 "aggregation_book"."pubdate" FROM "aggregation_book" WHERE
 "aggregation_book"."id" <= 10 UNION SELECT "aggregation_book"."id",
 "aggregation_book"."isbn", "aggregation_book"."name",
 "aggregation_book"."pages", "aggregation_book"."rating",
 "aggregation_book"."price", "aggregation_book"."contact_id",
 "aggregation_book"."publisher_id", "aggregation_book"."pubdate" FROM
 "aggregation_book" WHERE "aggregation_book"."id" > 10

 There's a similar bug when using filter + non-aggregating annotate
 functions.  The annotated field is not added, and an exception is not
 raised.
 {{{
 qs1 = Book.objects.filter(pk__lte=10)
 qs2 = Book.objects.filter(pk__gt=10)
 qs3 = qs1.union(qs2)
 qs4  = qs3.annotate(annotateField=F('id')+1)
 print (qs4.query)
 }}}
 SELECT "aggregation_book"."id", "aggregation_book"."isbn",
 "aggregation_book"."name", "aggregation_book"."pages",
 "aggregation_book"."rating", "aggregation_book"."price",
 "aggregation_book"."contact_id", "aggregation_book"."publisher_id",
 "aggregation_book"."pubdate" FROM "aggregation_book" WHERE
 "aggregation_book"."id" <= 10 UNION SELECT "aggregation_book"."id",
 "aggregation_book"."isbn", "aggregation_book"."name",
 "aggregation_book"."pages", "aggregation_book"."rating",
 "aggregation_book"."price", "aggregation_book"."contact_id",
 "aggregation_book"."publisher_id", "aggregation_book"."pubdate" FROM
 "aggregation_book" WHERE "aggregation_book"."id" > 10

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Re: [Django] #30209: Union with group by don't generate correct Subquery

2019-03-18 Thread Django

Comment (by Simon Charette):

> I'm not sure what exception class should be used here. TypeError?
Thoughts?

Good question. I know that
[https://docs.djangoproject.com/en/2.1/ref/models/querysets/#union we're
currently preventing some operations on combined querysets] so I'd try to
see what type of exception we're currently raising and stick to it to be
coherent. I think `.filter()` is disallowed for example. It's possible
that we simply crash though.

I think the best place to add this check would be in
`query.Queryset.annotate` just before `set_group_by`

[https://github.com/django/django/blob/418263c457636d3301f2068c47f09a0f42e15c52/django/db/models/query.py#L1052
is called] if an annotation contains aggregates.

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Re: [Django] #30209: Union with group by don't generate correct Subquery

2019-03-18 Thread Django

Comment (by TKdka):

Replying to [comment:5 Simon Charette]:
> > I'm planning to make this a sub query pushdown as suggested. FYI, this
is my first contribution to the code base, so suggestions and feedback
would be most appreciated.
>
> TKdka, not to discourage you but this is certainly going to be a hard
first contribution as the ORM doesn't have any formalized API to perform
such pushdown yet. If that can provide you any guidance the most similar
code I can think of is in `django.db.models.sql.Query.get_aggregation`.

After looking into this, you are completely right that it's a big
endeavor. The difficult part is that the query needs to be manipulated
even after the annotate call, which is significantly different from the
aggregate example.

Therefore, I'll submit a small patch that raises an exception when this is
attempted.

I'm not sure what exception class should be used here. TypeError?
Thoughts?

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Re: [Django] #30209: Union with group by don't generate correct Subquery

2019-03-16 Thread Django

Comment (by TKdka):

Thanks for the guidance and code reference. As nobody else has stepped up
on this in 3 weeks, I'll give it a shot (-:

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Re: [Django] #30209: Union with group by don't generate correct Subquery

2019-03-15 Thread Django

Comment (by Simon Charette):

> I'm planning to make this a sub query pushdown as suggested. FYI, this
is my first contribution to the code base, so suggestions and feedback
would be most appreciated.

TKdka, not to discourage you but this is certainly going to be a hard
first contribution as the ORM doesn't have any formalized API to perform
such pushdown yet. If that can provide you any guidance the most similar
code I can think of is in `django.db.models.sql.Query.get_aggregation`.

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Re: [Django] #30209: Union with group by don't generate correct Subquery

2019-03-15 Thread Django

Comment (by TKdka):

Replying to [comment:2 Simon Charette]:
> I agree that either an exception should be raised and the
[https://docs.djangoproject.com/en/2.1/ref/models/querysets/#union
documentation be adjusted] to explicitly mention aggregation won't work or
adding an aggregate function should perform a subquery pushdown.

I'm planning to make this a sub query pushdown as suggested. FYI, this is
my first contribution to the code base, so suggestions and feedback would
be most appreciated.

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Re: [Django] #30209: Union with group by don't generate correct Subquery

2019-02-24 Thread Django

#30209: Union with group by don't generate correct Subquery
-+-
 Reporter:  Nikolas  |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Database layer   |  Version:  master
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  union, group by  | Triage Stage:  Accepted
Has patch:  0|  Needs documentation:  1
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-

Comment (by Nikolas):

 Replying to [comment:2 Simon Charette]:
 > I agree that either an exception should be raised and the
 [https://docs.djangoproject.com/en/2.1/ref/models/querysets/#union
 documentation be adjusted] to explicitly mention aggregation won't work or
 adding an aggregate function should perform a subquery pushdown.


 Please can help, how can rewrite query for correct work My boss shut
 me in close time, but i stock there)

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Re: [Django] #30209: Union with group by don't generate correct Subquery

2019-02-24 Thread Django

#30209: Union with group by don't generate correct Subquery
-+-
 Reporter:  Nikolas  |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Database layer   |  Version:  master
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  union, group by  | Triage Stage:  Accepted
Has patch:  0|  Needs documentation:  1
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by Simon Charette):

 * needs_docs:  0 => 1
 * version:  1.11 => master
 * stage:  Unreviewed => Accepted


Comment:

 I agree that either an exception should be raised and the
 [https://docs.djangoproject.com/en/2.1/ref/models/querysets/#union
 documentation be adjusted] to explicitly mention aggregation won't work or
 adding an aggregate function should perform a subquery pushdown.

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Re: [Django] #30209: Union with group by don't generate correct Subquery

2019-02-24 Thread Django

#30209: Union with group by don't generate correct Subquery
-+-
 Reporter:  Nikolas  |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Database layer   |  Version:  1.11
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  union, group by  | Triage Stage:
 |  Unreviewed
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by Nikolas):

 * type:  Uncategorized => Bug


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Re: [Django] #30209: Union with group by don't generate correct Subquery

2019-02-24 Thread Django

#30209: Union with group by don't generate correct Subquery
-+-
 Reporter:  Nikolas  |Owner:  nobody
 Type:  Uncategorized|   Status:  new
Component:  Database layer   |  Version:  1.11
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  union, group by  | Triage Stage:
 |  Unreviewed
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by Nikolas):

 * Attachment "2eab4a5318.jpg" added.

 screenshot

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[Django] #30209: Union with group by don't generate correct Subquery

2019-02-24 Thread Django

#30209: Union with group by don't generate correct Subquery
-+-
   Reporter:  Nikolas|  Owner:  nobody
   Type: | Status:  new
  Uncategorized  |
  Component:  Database   |Version:  1.11
  layer (models, ORM)|
   Severity:  Normal |   Keywords:  union, group by
   Triage Stage: |  Has patch:  0
  Unreviewed |
Needs documentation:  0  |Needs tests:  0
Patch needs improvement:  0  |  Easy pickings:  0
  UI/UX:  0  |
-+-
 reopen: https://code.djangoproject.com/ticket/30203

 Simplified for example:
 have simple query


 {{{
 qs1: QuerySet = User.objects.filter(id__gt=10)

 qs1 = qs1.values('is_active').annotate(id=Count('pk'))
 }}}

 generate:

 {{{
 SELECT "suser_customuser"."is_active",
COUNT("suser_customuser"."id") AS "id"
 FROM "suser_customuser"
 WHERE "suser_customuser"."id" > 10
 GROUP BY "suser_customuser"."is_active"
 }}}

 all correct, now i wont use union

 {{{
 qs1: QuerySet = User.objects.filter(id__gt=10)
 qs2: QuerySet = User.objects.filter(id__lt=10)

 qs1 = qs1.values('is_active').annotate(id=Count('pk'))

 }}}

 now get not correct SQL:

 {{{
   (SELECT "suser_customuser"."is_active",
   "suser_customuser"."id"
FROM "suser_customuser"
WHERE "suser_customuser"."id" > 10)
 UNION
   (SELECT "suser_customuser"."is_active",
   "suser_customuser"."id"
FROM "suser_customuser"
WHERE "suser_customuser"."id" < 10)
 }}}


 expected:

 {{{
 select *
 from
   ((SELECT "suser_customuser"."is_active",
   "suser_customuser"."id"
FROM "suser_customuser"
WHERE "suser_customuser"."id" > 10)
 UNION
   (SELECT "suser_customuser"."is_active",
   "suser_customuser"."id"
FROM "suser_customuser"
WHERE "suser_customuser"."id" < 10)) U0
 group by is_active, id
 }}}


 i think this is bug, if not why not show any warning or exception?
 or just say how rewrite query for correct use Subquery

 screenshot:
 http://dl4.joxi.net/drive/2019/02/24/0002/0003/143363/63/2eab4a5318.jpg

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Re: [Django] #30209: Union with group by don't generate correct Subquery

Re: [Django] #30209: Union with group by don't generate correct Subquery

Re: [Django] #30209: Union with group by don't generate correct Subquery

Re: [Django] #30209: Union with group by don't generate correct Subquery

Re: [Django] #30209: Union with group by don't generate correct Subquery

Re: [Django] #30209: Union with group by don't generate correct Subquery

Re: [Django] #30209: Union with group by don't generate correct Subquery

Re: [Django] #30209: Union with group by don't generate correct Subquery

Re: [Django] #30209: Union with group by don't generate correct Subquery

Re: [Django] #30209: Union with group by don't generate correct Subquery

Re: [Django] #30209: Union with group by don't generate correct Subquery

Re: [Django] #30209: Union with group by don't generate correct Subquery

Re: [Django] #30209: Union with group by don't generate correct Subquery

Re: [Django] #30209: Union with group by don't generate correct Subquery

Re: [Django] #30209: Union with group by don't generate correct Subquery

[Django] #30209: Union with group by don't generate correct Subquery

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