documentation help

From: Paul Tilles <paul(dot)tilles(at)noaa(dot)gov>
To: pgsql-general(at)postgresql(dot)org
Subject: documentation help
Date: 2017-12-28 14:22:07
Message-ID: 2f41b337-d8ed-6c56-dfc0-c96634346b98@noaa.gov
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I just read the interesting article by Hans-Juergen Schoenig describing
how to speed up GROUP BY and JOIN. In the article, he mentions using an
"optimization barrier" where the SQL is

WITH x AS

Can somebody tell me where in the postgres docs I can find information
about this SQL?

TIA.

Paul Tilles

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