#35235: ArrayAgg() doesn't return default when filter contains __in=[].
     Reporter:  Per Carlsen       |                    Owner:  Sharon Woo
         Type:  Bug               |                   Status:  assigned
    Component:  contrib.postgres  |                  Version:  5.0
     Severity:  Normal            |               Resolution:
     Keywords:  ArrayAgg          |             Triage Stage:  Accepted
    Has patch:  0                 |      Needs documentation:  0
  Needs tests:  0                 |  Patch needs improvement:  0
Easy pickings:  0                 |                    UI/UX:  0
Comment (by Simon Charette):

 > Would there be any harm in simply changing @cached_property on
 BaseExpression._output_field_or_none to @property?

 I would definitely support that change! The cache invalidation challenges
 that the current implementation impose don't seem worth the mere caching
 benefits that caching `_output_field_or_none` over the already existing
 cached `output_field` cache provide.
Ticket URL: <https://code.djangoproject.com/ticket/35235#comment:12>
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