[Django] #34534: Migration operation optimisations

[Django]

#34534: Migration operation optimisations
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Reporter: David | Owner: nobody
Sanders |
Type: | Status: new
Cleanup/optimization |
Component: Database | Version: dev
layer (models, ORM) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 1
UI/UX: 0 |
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From https://github.com/django/django/pull/16819#issuecomment-1529913703

- RenameIndex can be reduced into CreateIndex
- DropConstraint can be reduced into CreateConstraint
- A question was raised whether constraints could be reduced into create
model though some databases do not support deferrable constraints (eg
MySQL)
- It's worth going over the operations to see if there are any other
potential reductions to add

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Ticket URL: <https://code.djangoproject.com/ticket/34534>
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