#24662: Sum() returns True/False when used with BooleanField & MySQL
-------------------------------------+-------------------------------------
Reporter: chriskief | Owner: marco-
| santamaria
Type: Bug | Status: assigned
Component: Database layer | Version: 1.8
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by akaariai):
`Count(bool_field)` isn't the same as `sum(bool_field)`, what you need is
`sum(case when true then 1 else 0 end)`. I think it is at least worth
considering if we should support min, max and sum for boolean fields.
Sum(bool_field) would be automatically converted to `sum(case when...)`
expression, min would be `min(case when true then 1 else 0 end)` and the
return value would be then converted to either True of False, likewise for
max().
The reason why I think this might be worth supporting is that this is what
you get in Python. For example `sum([True, False, False, True]) == 2` and
min and max work similarly to the above explanation, too.
--
Ticket URL: <https://code.djangoproject.com/ticket/24662#comment:8>
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