facebook/presto — pull request #932 by electrum (2013-12-30 18:55:14+00:00)
Title: Remove support for implicit cross joins

Supporting implicit cross joins without properly supporting pre-ANSI
join syntax will result in extremely expensive queries. Also, that
syntax makes it very easy to accidentally perform a cross join when
an inner join was intended, not to mention resulting in harder to
read queries, so we need a way to disable it via configuration.