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

David Rowley <drowley@postgresql.org>

Commit: 8145b5e138c7f26594fb93e11e6ebd5bf2aba586
Author: David Rowley <drowley@postgresql.org>
Date: 2023-06-22T00:47:53Z
Releases: 14.9
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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