[web2py] question about count()

[weheh]

To the best of my knowledge, count() doesn't take an argument, such as
left. I would like to be proven wrong. If so, then how do we count if
there's a left join, except by doing a select and then a
len(db(query).select(...left=[...]))? Seems like it should be able to
do db(query).count(left=[...]).