BUG #16255: No respect for 'not materialized' on CTEs with group by

From: PG Bug reporting form <noreply(at)postgresql(dot)org>
To: pgsql-bugs(at)lists(dot)postgresql(dot)org
Cc: robfordww(at)gmail(dot)com
Subject: BUG #16255: No respect for 'not materialized' on CTEs with group by
Date: 2020-02-12 12:28:25
Message-ID: 16255-e18a59c1ef606bbc@postgresql.org
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The following bug has been logged on the website:

Bug reference: 16255
Logged by: Robert Ford
Email address: robfordww(at)gmail(dot)com
PostgreSQL version: 12.1
Operating system: Windows
Description:

I have an simple CTE expression with group by and a string_aggr() function,
and Postgresql seems to materialize it anyhow, even if 'not materialized' is
instructed. I can't see that this is documented behaviour.

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