Jeff Davis <[EMAIL PROTECTED]> writes: > * Mutual Recursion: > > with recursive > foo(i) as (values(1) union all select i+1 from bar where i < 10), > bar(i) as (values(1) union all select i+1 from foo where i < 10) > select * from foo; > ERROR: mutual recursive call is not supported > > The standard allows mutual recursion.
This seems to be a point of confusion. I originally read the standard and concluded that mutual recursion was an optional feature. Itagaki-san showed me a copy of the spec where it seemed there was a clear blanket prohibition on mutually recursive queries and in fact anything but simple linearly expandable queries. I wonder if there are different versions of the spec floating around on this point. Take a second look at your spec and read on to where it defines "linear" and "expandable". If it doesn't define those terms then it's definitely different from what I read. If it does, read on to see what it does with them. The main reason to define them appeared to be to use them to say that supporting mutual recursion is not required. -- Gregory Stark EnterpriseDB http://www.enterprisedb.com Ask me about EnterpriseDB's PostGIS support! -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
