Re: Improve errhint for ALTER SUBSCRIPTION ADD/DROP PUBLICATION

Hello

On 2022-Oct-17, houzj(dot)fnst(at)fujitsu(dot)com wrote:

> alter subscription sub add publication pub2;

> Because I was executing the ADD PUBLICATION command, I feel the hint should
> also mention it instead of SET PUBLICATION.

Hmm, ok. But:

> @@ -1236,8 +1237,9 @@ AlterSubscription(ParseState *pstate, AlterSubscriptionStmt *stmt,
> ereport(ERROR,
> (errcode(ERRCODE_SYNTAX_ERROR),
> errmsg("ALTER SUBSCRIPTION with refresh and copy_data is not allowed when two_phase is enabled"),
> - errhint("Use ALTER SUBSCRIPTION ... SET PUBLICATION with refresh = false, or with copy_data = false"
> - ", or use DROP/CREATE SUBSCRIPTION.")));
> + errhint("Use ALTER SUBSCRIPTION ... %s PUBLICATION with refresh = false, or with copy_data = false"
> + ", or use DROP/CREATE SUBSCRIPTION.",
> + isadd ? "ADD" : "DROP")));

This looks confusing for translators. I propose to move the whole
command out of the message, not just one piece of it:

+ /*- translator: %s is an ALTER DDL command */
+ errhint("Use %s with refresh = false, or with copy_data = false, or use DROP/CREATE SUBSCRIPTION.",
isadd ? "ALTER SUBSCRIPTION ... ADD PUBLICATION" : ALTER SUBSCRIPTION ... DROP PUBLICATION")

I'm not sure that ERRCODE_SYNTAX_ERROR is the right thing here; sounds
like ERRCODE_FEATURE_NOT_SUPPORTED might be more appropriate.

--
Álvaro Herrera 48°01'N 7°57'E — https://www.EnterpriseDB.com/
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