#37115: Add support for Generic Relations / Table-Valued Expressions in the ORM
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Reporter: Pravin | Owner: Pravin
Type: New feature | Status: assigned
Component: Database layer | Version: dev
(models, ORM) |
Severity: Normal | Resolution:
Keywords: Table-Valued | Triage Stage: Accepted
expressions, Set-returning |
functions, SRF, generate_series, |
Postgres, Orm |
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Simon Charette):
> It seems like this may be related to the ​suggestion to add CTE support
to the ORM.
I believe so. The moment we have
1. A way to express a tuple of expressions (`CompositeField`) as
`Expression.output_field`
2. Adapted `BaseTable` and `Join` machinery to take advantage of 1.
The only part missing to add support for CTE is to allow compilation
directives to be attached to ''table like directive'' objects (e.g. a
`TableExpression(Expression).output_field: CompositeField` that would
serve as a base class for `BaseTable` and `Join`) to inform the
compilation layer (`compiler.SQLCompiler`) that the resulting SQL should
prefix the query instead of being inlined in the `FROM` clause.
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Ticket URL: <https://code.djangoproject.com/ticket/37115#comment:8>
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