Re: [Django] #32840: Micro-optimisation possibility in Field.get_col

[Django]

#32840: Micro-optimisation possibility in Field.get_col
-+-
 Reporter:  Keryn Knight |Owner:  Keryn
 Type:   |  Knight
  Cleanup/optimization   |   Status:  closed
Component:  Database layer   |  Version:  dev
  (models, ORM)  |
 Severity:  Normal   |   Resolution:  fixed
 Keywords:   | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by Mariusz Felisiak):

 * needs_better_patch:  1 => 0


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Re: [Django] #32840: Micro-optimisation possibility in Field.get_col

[Django]

#32840: Micro-optimisation possibility in Field.get_col
-+-
 Reporter:  Keryn Knight |Owner:  Keryn
 Type:   |  Knight
  Cleanup/optimization   |   Status:  closed
Component:  Database layer   |  Version:  dev
  (models, ORM)  |
 Severity:  Normal   |   Resolution:  fixed
 Keywords:   | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  1
Easy pickings:  0|UI/UX:  0
-+-
Changes (by GitHub ):

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


Comment:

 In [changeset:"5013798fe9a87b693ddb5589a8a408a04a873781" 5013798f]:
 {{{
 #!CommitTicketReference repository=""
 revision="5013798fe9a87b693ddb5589a8a408a04a873781"
 Fixed #32840 -- Optimized Field.get_col().

 get_col() used "self" as "output_field" when it was not given, and
 unnecessarily compared "self" to "self".

 Co-authored-by: Chris Jerdonek 
 Co-authored-by: Mariusz Felisiak 
 }}}

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Re: [Django] #32840: Micro-optimisation possibility in Field.get_col

[Django]

#32840: Micro-optimisation possibility in Field.get_col
-+-
 Reporter:  Keryn Knight |Owner:  Keryn
 Type:   |  Knight
  Cleanup/optimization   |   Status:  assigned
Component:  Database layer   |  Version:  dev
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:   | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  1
Easy pickings:  0|UI/UX:  0
-+-
Changes (by Keryn Knight):

 * needs_better_patch:  0 => 1


Comment:

 Updating state based on initial review on the PR.

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Re: [Django] #32840: Micro-optimisation possibility in Field.get_col

[Django]

#32840: Micro-optimisation possibility in Field.get_col
-+-
 Reporter:  Keryn Knight |Owner:  Keryn
 Type:   |  Knight
  Cleanup/optimization   |   Status:  assigned
Component:  Database layer   |  Version:  dev
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:   | Triage Stage:  Accepted
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by Keryn Knight):

 * has_patch:  0 => 1


Comment:

 PR is here: https://github.com/django/django/pull/14585
 For consistency across 2 separate comment areas:

 The reason I've not opted for the suggested alternative above (and have
 instead kept my rough original proposal) is not a criticism of it, but for
 keeping intent as clear as possible -- the version which was suggested
 relies on the mental parsing of the `x or y` twice (which always causes
 ''me'' to double take) and leaves open an accidental regression in the
 future should someone justify an implementation of `Field.__bool__` which
 is equally/more costly as `Field.__eq__` (I think).

 (Obviously I can change that stance, if it's even deemed worthwhile doing
 it. We'll see)

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Re: [Django] #32840: Micro-optimisation possibility in Field.get_col

[Django]

#32840: Micro-optimisation possibility in Field.get_col
-+-
 Reporter:  Keryn Knight |Owner:  Keryn
 Type:   |  Knight
  Cleanup/optimization   |   Status:  assigned
Component:  Database layer   |  Version:  dev
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:   | Triage Stage:  Accepted
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by Keryn Knight):

 * owner:  nobody => Keryn Knight
 * status:  new => assigned


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Ticket URL: 
Django 
The Web framework for perfectionists with deadlines.

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Re: [Django] #32840: Micro-optimisation possibility in Field.get_col

[Django]

#32840: Micro-optimisation possibility in Field.get_col
-+-
 Reporter:  Keryn Knight |Owner:  nobody
 Type:   |   Status:  new
  Cleanup/optimization   |
Component:  Database layer   |  Version:  dev
  (models, ORM)  |
 Severity:  Normal   |   Resolution:
 Keywords:   | Triage Stage:  Accepted
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by Carlton Gibson):

 * stage:  Unreviewed => Accepted


Comment:

 Hi Keryn, thanks. I'm going to provisionally Accept this to let
 Mariusz/Simon have a look at it in PR.

 I wonder if we need the initial conditional at all... 樂

 Untested, but same idea I think:

 {{{
 def get_col(self, alias, output_field=None):
 if alias != self.model._meta.db_table or (output_field and
 output_field != self):
 from django.db.models.expressions import Col
 return Col(alias, self, output_field or self)
 else:
 return self.cached_col
 }}}


 > I'm purposefully avoiding making further investigation/judgement about
 whether output_field != self is itself necessary, because it's ostensibly
 possible for a custom output_field to be provided which has the same
 creation_counter + model and I don't know how likely that is.

 Yes.

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