> 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 <jimmy76@xxxxxxxxx> wrote:
On Thu, Sep 16, 2021 at 4:51 AM Steve Pritchard <steve.pritchard@xxxxxxx> 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
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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)
