On Fri, 2010-01-22 at 11:14 -0800, David E.Wheeler wrote: > No performance issues
ISTM that this class of function is inherently dangerous performance wise. * It looks incredibly easy to construct enormous lists. We should test the explosion limit of this to see how it is handled. Perhaps we need some parameter limits to control that, depending upon results. * Optimizer doesn't consider whether the result type of an aggregate get bigger as the aggregate processes more rows. If we're adding this function we should give some thought in that area also, or at least a comment to note that it can and will cause the optimizer problems in complex queries. -- Simon Riggs www.2ndQuadrant.com -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
