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From: James Pang <[email protected]>
To: [email protected]
To: Laurenz Albe <[email protected]>
Subject: Re: cached plan must not change result type
Date: Fri, 29 Mar 2024 16:56:31 +0800
Message-ID: <CAHgTRfe+REHqYoQJ_ykj_p416PbdHz+UN06-R3PVr6auMx4w2g@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <CAHgTRfcg2jGnjSqq1NVuMDtCjRU3aOXWrhXn1L=92Ka_Ug6euw@mail.gmail.com>
	<[email protected]>

Thanks Laurenz,  forwarded to pgjdbc,  we want to understand why JDBC
failed to reexecute the SQL instead of throw error out. Like this document
https://jdbc.postgresql.org/documentation/server-prepare/#re-execution-of-failed-statements
.



Thanks,



James

Laurenz Albe <[email protected]> 於 2024年3月29日週五 下午4:40寫道：

> On Fri, 2024-03-29 at 10:05 +0800, James Pang wrote:
> > PGV14, client use PGJDBC driver and prepared statements, when a table
> > "alter table alter column type ..." changes done, a lot of JDBC clients
> > got this error "cached plan must not change result type".  when a JDBC
> > client got this error first time after the DDL schema change, JDBC driver
> > will clear this caching-plan and following same SQL statement got parsing
> > again and new cached plan right?
>
> Not sure; what do you observe?
> Anyway, this is a known problem:
> https://jdbc.postgresql.org/documentation/server-prepare/#ddl
>
> > How to avoid this issue when DDL schema changes ?
>
> Don't use server-side prepared statements:
> https://jdbc.postgresql.org/documentation/server-prepare/#deactivation
> You'll lose some performance though.
>
> Questions like this had better be asked on the pgsql-jdbc list.
>
> Yours,
> Laurenz Albe
>

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