Doc: mention that extended stats aren't used for joins

David Rowley <drowley@postgresql.org>

Commit: 59634df871a4a63af679ddace44ded7492fd83bc
Author: David Rowley <drowley@postgresql.org>
Date: 2023-06-22T00:51:36Z
Releases: 11.21
Doc: mention that extended stats aren't used for joins

Statistics defined by the CREATE STATISTICS command are only used to
assist with the selectivity estimations of base relations, never for
joins.  Here we mention this fact in the notes section of the CREATE
STATISTICS command.

Discussion: https://postgr.es/m/CAApHDvrMuVgDOrmg_EtFDZ=AOovq6EsJNnHH1ddyZ8EqL4yzMw@mail.gmail.com
Backpatch-through: 11

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doc/src/sgml/ref/create_statistics.sgml modified +6 −0

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