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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Dave Cramer <davecramer@postgres.rocks>
Cc: ZhangChi <798604270@qq.com>
Cc: Greg Sabino Mullane <htamfids@gmail.com>
Cc: David G. Johnston <david.g.johnston@gmail.com>
Cc: pgsql-bugs@lists.postgresql.org <pgsql-bugs@lists.postgresql.org>
Subject: Re: BUG #19350: Short circuit optimization missed when runningsqlscriptes in JDBC
Date: Wed, 17 Dec 2025 10:44:03 -0500
Message-ID: <2629415.1765986243@sss.pgh.pa.us> (raw)
In-Reply-To: <CADK3HH+EK4qM74YVGobr+oWcpe-EFoKGtQDDtt+Yd87nsVeHsQ@mail.gmail.com>
References: <19350-aed90efec73c66cc@postgresql.org>
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	<CADK3HH+EK4qM74YVGobr+oWcpe-EFoKGtQDDtt+Yd87nsVeHsQ@mail.gmail.com>

Dave Cramer <davecramer@postgres.rocks> writes:
> On Tue, 16 Dec 2025 at 20:40, ZhangChi <798604270@qq.com> wrote:
>> But my question is that in the CLI, the test case (like foo2) I showed can
>> return the results. But when I run the same test case in JDBC, the test
>> case triggers an error. I wonder why there is an inconsistency.

> Possibly because JDBC does everything using the V3 protocol whereas psql
> does not. psql uses simple query.

The error will occur if we try to build a "custom plan" for the
prepared query.  I suspect a discrepancy in the plan_cache_mode
settings between JDBC and the user's psql setup.

			regards, tom lane





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