The missing bit of context is that concat() is there because early on in Postgres's life there was an effort to have a full suite of Oracle compatibility functions. If someone suggested it now they would be pushed towards making it an extension or pointed at EDB. But things like concat are the remnants of that.
-- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers