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From: Alvaro Herrera <[email protected]>
To: Zhijie Hou (Fujitsu) <[email protected]>
Cc: Antonin Houska <[email protected]>
Cc: Srinath Reddy Sadipiralla <[email protected]>
Cc: [email protected] <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: BUG #19500: pgrepack logical decoding plugin can crash assert builds via SQL decoding API
Date: Mon, 8 Jun 2026 21:50:16 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <TY4PR01MB17718C5A3450599FB1C6DFA5A94112@TY4PR01MB17718.jpnprd01.prod.outlook.com>

On 2026-Jun-05, Zhijie Hou (Fujitsu) wrote:

> I have no objection to the proposed approach. But I would like to confirm
> whether reporting an ERROR in the startup callback (when the context is not a
> REPACK decoding worker) is considered acceptable.
> 
> Like:
> 
> repack_startup(LogicalDecodingContext *ctx, OutputPluginOptions *opt,
> 			   bool is_init)
> ...
> 	if (!AmRepackWorker())
> 		ereport(ERROR,
> 				errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
> 				errmsg("this plugin can only be used by REPACK (CONCURRENTLY)"));

Hmm, yeah, that works for me, we can ditch the magic number then.  I'm
considering something like the attached.  I added the test case and
edited nearby comments.  Will stare some more at it tomorrow ...

-- 
Álvaro Herrera         PostgreSQL Developer  —  https://www.EnterpriseDB.com/


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