pgsql: Doc: clarify the conditions of usable indexes for REPLICA IDENTI

From: Masahiko Sawada <msawada(at)postgresql(dot)org>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Doc: clarify the conditions of usable indexes for REPLICA IDENTI
Date: 2023-07-13 06:05:57
Message-ID: E1qJpSf-00082u-5s@gemulon.postgresql.org
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Doc: clarify the conditions of usable indexes for REPLICA IDENTITY FULL tables.

Commit 89e46da5e allowed REPLICA IDENTITY FULL tables to use an index
on the subscriber during apply of update/delete. This commit clarifies
in the documentation that the leftmost field of candidate indexes must
be a column (not an expression) that references the published relation
column.

The source code comments are also updated accordingly.

Reviewed-by: Peter Smith, Amit Kapila
Discussion: https://postgr.es/m/CAD21AoDJjffEvUFKXT27Q5U8-UU9JHv4rrJ9Ke8Zkc5UPWHLvA@mail.gmail.com
Backpatch-through: 16

Branch
------
REL_16_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/4946910a875ce84823236f2a06e576b16080465f

Modified Files
--------------
doc/src/sgml/logical-replication.sgml | 12 ++++++------
src/backend/executor/execReplication.c | 6 +++---
src/backend/replication/logical/relation.c | 11 ++++-------
3 files changed, 13 insertions(+), 16 deletions(-)

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