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
27719	Add queryset.alias() to mimic .annotate() for aggregations without loading data	Marc Tamlyn	Alexandr Tatarinov	"At the moment the Expressions API currently does not allow creating a value for later use in the query without returning that data from the database. In some cases this can be quite expensive over the pipe, and can also influence query execution where functional indexes are involved. I would like to introduce an API like `alias()`, which does the same thing as `annotate()` to allow reuse in later querysets but doesn't return the value.

To be explicit, we are changing a query from one of the form:

`SELECT to_tsvector('english', ""some_field""), ""some"", ""other"", ""fields"" FROM ""table"" WHERE to_tsvector('english', ""some_field"") @@ plainto_tsquery(""search term"") ... LIMIT 10;`

to one of the form:

`SELECT ""some"", ""other"", ""fields"" FROM ""table"" WHERE to_tsvector('english', ""some_field"") @@ plainto_tsquery(""search term"") ... LIMIT 10;`
"	New feature	closed	Database layer (models, ORM)	dev	Normal	fixed			Ready for checkin	1	0	0	0	0	0