Re: [Django] #25544: prefetch_related sends duplicate ids to database

[Django]

#25544: prefetch_related sends duplicate ids to database
-+-
 Reporter:  Julien Hartmann  |Owner:  Ian Foote
 Type:   |   Status:  closed
  Cleanup/optimization   |
Component:  Database layer   |  Version:  master
  (models, ORM)  |
 Severity:  Normal   |   Resolution:  fixed
 Keywords:  prefetch duplicate   | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-

Comment (by Nick Pope):

 The fix to this resulted in a regression where parameters passed to `__in`
 were reordered due to the use of `set()`. See #29503.

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Re: [Django] #25544: prefetch_related sends duplicate ids to database

[Django]

#25544: prefetch_related sends duplicate ids to database
-+-
 Reporter:  spectras |Owner:  Ian-Foote
 Type:   |   Status:  closed
  Cleanup/optimization   |
Component:  Database layer   |  Version:  master
  (models, ORM)  |
 Severity:  Normal   |   Resolution:  fixed
 Keywords:  prefetch duplicate   | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by Tim Graham ):

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


Comment:

 In [changeset:"86eccdc8b67728d84440a46e5bf62c78f2eddf6d" 86eccdc8]:
 {{{
 #!CommitTicketReference repository=""
 revision="86eccdc8b67728d84440a46e5bf62c78f2eddf6d"
 Fixed #25544 -- Removed duplicate ids in prefetch_related() queries.
 }}}

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Re: [Django] #25544: prefetch_related sends duplicate ids to database

[Django]

#25544: prefetch_related sends duplicate ids to database
-+-
 Reporter:  spectras |Owner:  Ian-Foote
 Type:   |   Status:  assigned
  Cleanup/optimization   |
Component:  Database layer   |  Version:  master
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  prefetch duplicate   | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by charettes):

 * needs_better_patch:  1 => 0
 * version:  1.8 => master


Comment:

 The comments have been addressed.

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Re: [Django] #25544: prefetch_related sends duplicate ids to database

[Django]

#25544: prefetch_related sends duplicate ids to database
-+-
 Reporter:  spectras |Owner:  Ian-Foote
 Type:   |   Status:  assigned
  Cleanup/optimization   |
Component:  Database layer   |  Version:  1.8
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  prefetch duplicate   | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  1
Easy pickings:  0|UI/UX:  0
-+-
Changes (by timgraham):

 * needs_better_patch:  0 => 1
 * stage:  Ready for checkin => Accepted


Comment:

 Latest comments on the PR indicates a few more tests should be added.

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Re: [Django] #25544: prefetch_related sends duplicate ids to database

[Django]

#25544: prefetch_related sends duplicate ids to database
-+-
 Reporter:  spectras |Owner:  Ian-Foote
 Type:   |   Status:  assigned
  Cleanup/optimization   |
Component:  Database layer   |  Version:  1.8
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  prefetch duplicate   | Triage Stage:  Ready for
 |  checkin
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by carljm):

 * stage:  Accepted => Ready for checkin


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Re: [Django] #25544: prefetch_related sends duplicate ids to database

[Django]

#25544: prefetch_related sends duplicate ids to database
-+-
 Reporter:  spectras |Owner:  Ian-Foote
 Type:   |   Status:  assigned
  Cleanup/optimization   |
Component:  Database layer   |  Version:  1.8
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  prefetch duplicate   | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by Ian-Foote):

 * needs_better_patch:  1 => 0


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Re: [Django] #25544: prefetch_related sends duplicate ids to database

[Django]

#25544: prefetch_related sends duplicate ids to database
-+-
 Reporter:  spectras |Owner:  Ian-Foote
 Type:   |   Status:  assigned
  Cleanup/optimization   |
Component:  Database layer   |  Version:  1.8
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  prefetch duplicate   | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  1
Easy pickings:  0|UI/UX:  0
-+-

Comment (by charettes):

 Might be worth pinging Mark about this.

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Re: [Django] #25544: prefetch_related sends duplicate ids to database

[Django]

#25544: prefetch_related sends duplicate ids to database
-+-
 Reporter:  spectras |Owner:  Ian-Foote
 Type:   |   Status:  assigned
  Cleanup/optimization   |
Component:  Database layer   |  Version:  1.8
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  prefetch duplicate   | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  1
Easy pickings:  0|UI/UX:  0
-+-

Comment (by spectras):

 I do not know if it is related, but  ̀ArrayField.get_db_prep_value` always
 converts tuples to lists.

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Re: [Django] #25544: prefetch_related sends duplicate ids to database

[Django]

#25544: prefetch_related sends duplicate ids to database
-+-
 Reporter:  spectras |Owner:  Ian-Foote
 Type:   |   Status:  assigned
  Cleanup/optimization   |
Component:  Database layer   |  Version:  1.8
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  prefetch duplicate   | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  1
Easy pickings:  0|UI/UX:  0
-+-

Comment (by akaariai):

 A possibility is to try-except the deduping of the values. If it doesn't
 succeed, just use the original values.

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Re: [Django] #25544: prefetch_related sends duplicate ids to database

[Django]

#25544: prefetch_related sends duplicate ids to database
-+-
 Reporter:  spectras |Owner:  Ian-Foote
 Type:   |   Status:  assigned
  Cleanup/optimization   |
Component:  Database layer   |  Version:  1.8
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  prefetch duplicate   | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  1
Easy pickings:  0|UI/UX:  0
-+-

Comment (by carljm):

 @charettes I think that's a good idea! As long as we're confident that a)
 there are no other valid cases outside ArrayField where an unhashable
 value might be passed in an `__in` lookup rhs, and b) every value passed
 to an ArrayField lookup should always be iterable. But I can't come up
 with any counter-examples to either of those.

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Re: [Django] #25544: prefetch_related sends duplicate ids to database

[Django]

#25544: prefetch_related sends duplicate ids to database
-+-
 Reporter:  spectras |Owner:  Ian-Foote
 Type:   |   Status:  assigned
  Cleanup/optimization   |
Component:  Database layer   |  Version:  1.8
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  prefetch duplicate   | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  1
Easy pickings:  0|UI/UX:  0
-+-

Comment (by charettes):

 @carljm, what do you think of simply special casing `ArrayField`'s `__in`
 lookup which is something we already do for `__exact` anyway.

 Something like the following comes to mind.

 {{{#!python
 @ArrayField.register_lookup
 class ArrayInLookup(InLookup):
 def get_prep_lookup(self):
 values = super(ArrayInLookup, self).get_prep_lookup()
 return [tuple(value) for value in values]
 }}}

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Re: [Django] #25544: prefetch_related sends duplicate ids to database

[Django]

#25544: prefetch_related sends duplicate ids to database
-+-
 Reporter:  spectras |Owner:  Ian-Foote
 Type:   |   Status:  assigned
  Cleanup/optimization   |
Component:  Database layer   |  Version:  1.8
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  prefetch duplicate   | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  1
Easy pickings:  0|UI/UX:  0
-+-

Comment (by carljm):

 @IanFoote Oops, my fault. I didn't consider the possibility that non-
 hashable values (e.g. lists for an ArrayField) could be passed to `__in`
 lookups. I don't really see a way to preserve this fix in the face of that
 possibility (going through the value and trying to convert everything to
 something hashable doesn't seem like a good plan), so unless you have any
 ideas I'm not seeing, I think we may need to revert to your previous fix
 at the `prefetch_related` layer.

 Sorry for the bad direction!

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Re: [Django] #25544: prefetch_related sends duplicate ids to database

[Django]

#25544: prefetch_related sends duplicate ids to database
-+-
 Reporter:  spectras |Owner:  Ian-Foote
 Type:   |   Status:  assigned
  Cleanup/optimization   |
Component:  Database layer   |  Version:  1.8
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  prefetch duplicate   | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  1
Easy pickings:  0|UI/UX:  0
-+-
Changes (by timgraham):

 * needs_better_patch:  0 => 1
 * has_patch:  0 => 1
 * stage:  Ready for checkin => Accepted


Comment:

 `postgres_tests.test_array.TestQuerying.test_in` fails.

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Re: [Django] #25544: prefetch_related sends duplicate ids to database

[Django]

#25544: prefetch_related sends duplicate ids to database
-+-
 Reporter:  spectras |Owner:  Ian-Foote
 Type:   |   Status:  assigned
  Cleanup/optimization   |
Component:  Database layer   |  Version:  1.8
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  prefetch duplicate   | Triage Stage:  Ready for
 |  checkin
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by carljm):

 * stage:  Accepted => Ready for checkin


Comment:

 Patch is ready, IMO. Waiting for actual merge until the CI catches up...

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Re: [Django] #25544: prefetch_related sends duplicate ids to database

[Django]

#25544: prefetch_related sends duplicate ids to database
-+-
 Reporter:  spectras |Owner:  Ian-Foote
 Type:   |   Status:  assigned
  Cleanup/optimization   |
Component:  Database layer   |  Version:  1.8
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  prefetch duplicate   | Triage Stage:  Accepted
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by Ian-Foote):

 * owner:  nobody => Ian-Foote
 * status:  new => assigned


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Re: [Django] #25544: prefetch_related sends duplicate ids to database

[Django]

#25544: prefetch_related sends duplicate ids to database
-+-
 Reporter:  spectras |Owner:  nobody
 Type:   |   Status:  new
  Cleanup/optimization   |
Component:  Database layer   |  Version:  1.8
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:  prefetch duplicate   | Triage Stage:  Accepted
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by timgraham):

 * needs_better_patch:   => 0
 * stage:  Unreviewed => Accepted
 * type:  Uncategorized => Cleanup/optimization
 * needs_tests:   => 0
 * needs_docs:   => 0


Comment:

 I'm not too familiar with this, but accepting on the basis for further
 investigation.

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[Django] #25544: prefetch_related sends duplicate ids to database

[Django]

#25544: prefetch_related sends duplicate ids to database
--+
 Reporter:  spectras  |  Owner:  nobody
 Type:  Uncategorized | Status:  new
Component:  Database layer (models, ORM)  |Version:  1.8
 Severity:  Normal|   Keywords:  prefetch
  |  duplicate
 Triage Stage:  Unreviewed|  Has patch:  0
Easy pickings:  0 |  UI/UX:  0
--+
 That may be intended, but it seems dubious, so…

 Issue happens when prefetching a model relation from another one, linked
 by a M2M field. Sample case:

 {{{#!python
 class Picture(Model):
 # some fields

 class Collection(Model):
 pictures = ManyToManyField(Picture, blank=True,
related_name='collections')
 # some fields

 class CollectionPermission(Model):
 content_object = ForeignKey(Collection,
 related_name='permissions')
 # fk to users and fk to permissions
 }}}

 When prefetching collection permissions from a picture queryset, like
 this:

 {{{#!python
 Picture.objects.prefetch_related('collections__permissions')
 }}}

 The third query (the second level of prefetching) looks like this:
 {{{#!sql
 SELECT "gallery_collectionpermission"."id",
"gallery_collectionpermission"."user_id",
"gallery_collectionpermission"."permission_id",
"gallery_collectionpermission"."content_object_id"
 FROM   "gallery_collectionpermission"
 WHERE  "gallery_collectionpermission"."content_object_id" IN (
  11, 11, 11, 11,
  11, 11, 11, 11,
  11, 11, 10, 10,
  10, 10, 10, 10,
  10, 10, 10, 10,
  10, 10, 10, 10,
  10, 10, 10, 10,
  10, 10, 10, 10,
  10, 10, 9, 9,
  9, 9, 9 )
 }}}

 The issue arises in two steps:
 * As prefetch has no identity mapping, the first prefetching step will
 build a different Collection instance for every picture that uses it.
 * Then the second prefetching step will gather all instances, and dump
 their ids to the database without looking for duplicates.

 Ideally, this could be fixed at the first step: when a queryset prefetches
 the same row several times, it would make sense to return a single
 instance. In this example, all Pictures' cache should point to the same
 Gallery instances.

 The second step could also be fixed: the related manager could eliminate
 duplicates when building the query. For some reason the
 ReverseSingleRelatedObjectDescriptor does it, but none of the other
 descriptors or managers do.

 The cost seems huge. Typically, I have collections of hundreds of
 pictures, but each picture will only appear in 4 or 5 collections. The
 query thus sends the db server tens of thousands of ids instead of a few
 dozens.

 Is there something I missed? Or is this use case out of the normal scope
 of `prefetch_related`?

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