Re: Negative LIMIT and OFFSET?
Tom Lane <tgl@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
To: Simon Riggs <simon@2ndquadrant.com>
Cc: Neil Conway <neilc@samurai.com>, Andrew Sullivan <ajs@crankycanuck.ca>, pgsql-hackers@postgresql.org
Date: 2008-03-10T03:40:30Z
Lists: pgsql-hackers
Simon Riggs <simon@2ndquadrant.com> writes: > On Thu, 2007-12-13 at 22:23 -0800, Neil Conway wrote: >> If "LIMIT n" means "emit at most n tuples", then a query that produces 0 >> rows with n < 0 is arguably violating its spec, since it has produced >> more tuples than the LIMIT specified (0 > n). Interpreted this way, no >> result set can be consistent with a negative limit, so I'd vote for >> throwing an error. > I even found an existing, unused error message called > ERRCODE_INVALID_LIMIT_VALUE > so here's a patch. Applied, but using just ERRCODE_INVALID_PARAMETER_VALUE rather than guessing what the SQL committee intended with that SQLSTATE. regards, tom lane