#29172: Using Window in Subquery causes AttributeError
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Reporter: Tomáš | Owner: nobody
Ehrlich |
Type: Bug | Status: assigned
Component: Database | Version: 2.0
layer (models, ORM) | Keywords: subquery window
Severity: Normal | expression orm
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Using Window expression within Subquery causes an `AttributeError:
'NoneType' object has no attribute ‘relabeled_clone'`
Error is raised in `relabeled_clone` method,
https://github.com/django/django/blob/master/django/db/models/expressions.py#L319
which calls `e.relabeled_clone` method on every expression returned from
`get_source_expressions`.
Window expression returns `source_expression`, `partition_by`, `order_by`
and `frame` in `get_source_expression`:
https://github.com/django/django/blob/master/django/db/models/expressions.py#L1188
but all parameters except `source_expression` are optional and might be
`None`. This leads to AttributeError.
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Ticket URL: <https://code.djangoproject.com/ticket/29172>
Django <https://code.djangoproject.com/>
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