#30244: Aggregate functions with filter have bug with state mutation in
get_source_expressions() method
-------------------------------------+-------------------------------------
Reporter: gtors | Owner: nobody
Type: Bug | Status: new
Component: Database | Version: 2.1
layer (models, ORM) |
Severity: Normal | Keywords:
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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Django 2.1.7
{{{
In [27]: s = Sum('x', filter=Q(x=1))
In [28]: s.get_source_expressions()
Out[28]: [F(x), <Q: (AND: ('x', 1))>]
In [29]: s.get_source_expressions()
Out[29]: [F(x), <Q: (AND: ('x', 1))>, <Q: (AND: ('x', 1))>]
In [30]: s.get_source_expressions()
Out[30]: [F(x), <Q: (AND: ('x', 1))>, <Q: (AND: ('x', 1))>, <Q: (AND:
('x', 1))>]
}}}
Each call of `get_source_expressions` on instance of aggregate function
causes list element duplication.
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Ticket URL: <https://code.djangoproject.com/ticket/30244>
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