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
24887	Remove one-arg limitation from django.db.models.aggregate	Anssi Kääriäinen	Greg Chapple	The resolve_expression() method of django.db.models.aggregates.Aggregate asserts that there is just single source expression. I don't see the reason for this limitation. There are aggregates (like SQLite's group_concat) that naturally take in multiple arguments. It seems group_concat works just fine with multiple source expressions if the assertion is removed.	Cleanup/optimization	closed	Database layer (models, ORM)	dev	Normal	fixed			Accepted	1	0	0	0	0	0