> Add the MATERIALIZED keyword to the WITH statement Many thanks Jim, that's just what I needed - that does the trick.
It's hard to keep abreast of these SQL changes. Thank goodness for mailing lists! Steve On Thu, 16 Sept 2021 at 11:56, Jim Mlodgenski <jimm...@gmail.com> wrote: > On Thu, Sep 16, 2021 at 4:51 AM Steve Pritchard <steve.pritch...@bto.org> > wrote: > > > > I have a PL/pgSQL function that I want to call within a query, but the > function is fairly expensive to execute so I only want it executed once > within the query. However the planner seems to reorganize my query so that > it calls the function for every row. > > > > We were previously on Pg 9.6 and this wasn't a problem then. But now > that we have upgraded to Pg 13, the behaviour has changed. > > > > The behavior for planning a CTE changed in PG12. > > > There must be a "proper" way to get the planner to call a function only > once. > > > Add the MATERIALIZED keyword to the WITH statement > -- Steve Pritchard Database Developer British Trust for Ornithology, The Nunnery, Thetford, Norfolk IP24 2PU, UK Tel: +44 (0)1842 750050, fax: +44 (0)1842 750030 Registered Charity No 216652 (England & Wales) No SC039193 (Scotland) Company Limited by Guarantee No 357284 (England & Wales)
