Re: BUG #18647: INSERT statements execute functions twice.

On 2024-Oct-09, Todd Brandys wrote:

> CREATE FUNCTION uuid.nextval ( IN i_regclass pg_catalog.regclass ) RETURNS pg_catalog.uuid AS $$
> SELECT raise.notice('***** uuid.nextval');
> WITH t_pool AS (
> SELECT pool.id_entity AS id_entity,
> pool.uuid AS uuid
> FROM uuid.pool
> WHERE pool.id_entity = i_regclass
> ORDER BY pg_catalog.RANDOM() ASC
> LIMIT 1

Not related to your reported problem, but note that the "order by
random()" pattern might be slow as uuid.pool becomes large. Andrew
Gierth wrote a blog post on this topic awhile ago which may be helpful:
https://blog.rhodiumtoad.org.uk/2009/03/08/selecting-random-rows-from-a-table/

--
Álvaro Herrera PostgreSQL Developer — https://www.EnterpriseDB.com/
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