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
13156	exists() selects all columns	Karen Tracey	nobody	"It doesn't seem like the behavior noted here: http://groups.google.com/group/django-developers/browse_thread/thread/186f933bf51f1fa0

ever got written up in a ticket. Besides exists() not being as efficient as documented, it used to be that the internal existence queries done by the ORM to check for existence of an object and decide whether to do an INSERT or UPDATE just pulled a constant 1 from the DB, not all columns of the instance being queried. Now these existence queries are pulling the 1 and all columns of the instance, which seems like it could be a performance regression."		closed	Database layer (models, ORM)	dev		fixed			Accepted	0	0	0	0	0	0