id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
28560	distinct() on None values	Mariusz Felisiak	Mariusz Felisiak	"`distinct()` doesn't work properly on `None` values. If we select columns with `null` values then `distinct()` returns each of them instead of single `None`, e.g. (based on `queries/tests.py`):

{{{
>>> list(Item.objects.filter(modified__isnull=True).values_list('modified', flat=True).distinct())
[None, None, None]
}}}

instead of `[None]`."	Bug	assigned	Database layer (models, ORM)	dev	Normal		distinct values		Unreviewed	0	0	0	0	0	0