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Revert "postgres_fdw: Inherit the local transaction's access/deferrable modes."

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We concluded that commit e5a3c9d9b is a feature rather than a fix; since
it was added after feature freeze, revert it.

Reported-by: Fujii Masao <masao.fujii@oss.nttdata.com>
Reported-by: Michael Paquier <michael@paquier.xyz>
Reported-by: Robert Haas <robertmhaas@gmail.com>
Discussion: https://postgr.es/m/ed2296f1-1a6b-4932-b870-5bb18c2591ae%40oss.nttdata.com
This commit is contained in:
Etsuro Fujita
2025-06-08 17:30:00 +09:00
parent 73e26cbeb5
commit 7d4667c620
6 changed files with 8 additions and 347 deletions
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15
doc/src/sgml/postgres-fdw.sgml
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@@ -1077,21 +1077,6 @@ postgres=# SELECT postgres_fdw_disconnect_all();
<productname>PostgreSQL</productname> release might modify these rules.
</para>
<para>
The remote transaction is opened in the same read/write mode as the local
transaction: if the local transaction is <literal>READ ONLY</literal>,
the remote transaction is opened in <literal>READ ONLY</literal> mode,
otherwise it is opened in <literal>READ WRITE</literal> mode.
(This rule is also applied to remote and local subtransactions.)
</para>
<para>
The remote transaction is also opened in the same deferrable mode as the
local transaction: if the local transaction is <literal>DEFERRABLE</literal>,
the remote transaction is opened in <literal>DEFERRABLE</literal> mode,
otherwise it is opened in <literal>NOT DEFERRABLE</literal> mode.
</para>
<para>
Note that it is currently not supported by
<filename>postgres_fdw</filename> to prepare the remote transaction for