  from django.db.models import (
      Avg, Case, Count, DecimalField, F, IntegerField, Max, Q, StdDev, Sum,
      Value, Variance, When,
  )
  from django.test import (
      TestCase, ignore_warnings, skipUnlessAnyDBFeature, skipUnlessDBFeature,
  )
  from django.test.utils import Approximate
  from django.utils.deprecation import RemovedInDjango31Warning
  
 
</s> remove         super().__init__(
            expression, distinct='DISTINCT ' if distinct else '',
            filter=filter, **extra
        )

    def _get_repr_options(self):
        return {**super()._get_repr_options(), 'distinct': self.extra['distinct'] != ''}
 </s> add         super().__init__(expression, filter=filter, **extra)
from django.db.models.aggregates import Aggregate
  from django.db.models import (
      Avg, Case, Count, DecimalField, F, IntegerField, Max, Q, StdDev, Sum,
      Value, Variance, When,
  )
from django.db.models.aggregates import Aggregate
  from django.test import (
      TestCase, ignore_warnings, skipUnlessAnyDBFeature, skipUnlessDBFeature,
  )
  from django.test.utils import Approximate
  from django.utils.deprecation import RemovedInDjango31Warning
  
keep keep keep add keep keep keep keep keep keep
 Fixed #28658 -- Added DISTINCT handling to the Aggregate class. 
tests/aggregation_regress/tests.py