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Étienne Beaulé 4e6f0024f1 [2.2.x] Fixed #30542 -- Fixed crash of numerical aggregations with filter.
Filters in annotations crashed when used with numerical-type
aggregations (i.e. Avg, StdDev, and Variance). This was caused as the
source expressions no not necessarily have an output_field (such as the
filter field), which lead to an AttributeError: 'WhereNode' object has
no attribute output_field.

Thanks to Chuan-Zheng Lee for the report.

Regression in c690afb873cac8035a3cb3be7c597a5ff0e4b261 and two following
commits.

Backport of 4b6dfe16226a81fea464ac5f77942f4d6ba266e8 from master.
2019-06-05 09:15:21 +02:00
..
2017-06-01 13:23:48 -04:00

To run the test suite, first, create and activate a virtual environment. Then
install some requirements and run the tests::

    $ cd tests
    $ pip install -e ..
    $ pip install -r requirements/py3.txt
    $ ./runtests.py

For more information about the test suite, see
https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/unit-tests/.