Andrew Gierth wrote: > >>>>> "Bruce" == Bruce Momjian <br...@momjian.us> writes: > > >> 1) select ... from foo, unnest(foo.bar); -- UNNEST is implicitly LATERAL > [...] > >> It's point (1) that's the killer - without it, unnest() is just a > >> trivial shorthand for stuff that can be done anyway; it doesn't > >> actually add any functionality. > > Bruce> OK, so what should the TODO wording be? > > Under "SQL Commands": > > * implement LATERAL (and corresponding UNNEST functionality) > > (LATERAL is, I suspect, a fairly big project because of the amount of > planner work involved, but it's also a fairly high-value project > because (a) it's useful (we usually get a couple of cases every week > on the IRC chan where people ask "how do I do X", where X would be > trivial with LATERAL but requires complex and often inefficient SQL > without it), and (b) it potentially presents optimization > opportunities even for queries that don't use it.)
Added to TODO: Support LATERAL subqueries Lateral subqueries can reference columns of tables defined outside the subquery at the same level. For example, a LATERAL subquery in a FROM clause could reference tables defined in the same FROM clause. Currently only the columns of tables defined above subqueries are recognized. -- Bruce Momjian <br...@momjian.us> http://momjian.us EnterpriseDB http://enterprisedb.com + If your life is a hard drive, Christ can be your backup. + -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers