[pgpool-hackers: 4206] Deal with idle_session_timeout

[Tatsuo Ishii]

Hi,

I have found an issue with idle_session_timeout which was introduced
in PostgreSQL 14.0.  If this parameter is enabled in postgresql.conf
and the timeout fires, Pgpool-II triggers failover if
failover_on_backend_error is on (the default). This is not good.

This is a similar issue fixed in:
https://git.postgresql.org/gitweb/?p=pgpool2.git;a=commit;h=3f5986eee360f12e6a0bb77aa46f95abf5f6bc10
In the commit we dealt with idle-in-transaction timeout.

Attached patch fixes the issue in the same direction as the commit
above: add detect_idle_session_timeout_error() to detect the error
code for idle_session_timeout. If the error is detected, Pgpool-II
returns the error code to frondend as a fatal error and disconnects
the session.

Best reagards,
--
Tatsuo Ishii
SRA OSS LLC
English: http://www.sraoss.co.jp/index_en/
Japanese:http://www.sraoss.co.jp
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