From: | James Pang <jamespang886(at)gmail(dot)com> |
---|---|
To: | pgsql-jdbc(at)lists(dot)postgresql(dot)org, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at> |
Subject: | Re: cached plan must not change result type |
Date: | 2024-03-29 08:56:31 |
Message-ID: | CAHgTRfe+REHqYoQJ_ykj_p416PbdHz+UN06-R3PVr6auMx4w2g@mail.gmail.com |
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Lists: | pgsql-admin pgsql-jdbc |
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 <laurenz(dot)albe(at)cybertec(dot)at> 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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