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help / color / mirror / Atom feedFrom: David G. Johnston <[email protected]>
To: shveta malik <[email protected]>
Cc: vignesh C <[email protected]>
Cc: Amit Kapila <[email protected]>
Cc: Peter Smith <[email protected]>
Cc: Shlok Kyal <[email protected]>
Cc: Dilip Kumar <[email protected]>
Cc: Zhijie Hou (Fujitsu) <[email protected]>
Cc: YeXiu <[email protected]>
Cc: Ian Lawrence Barwick <[email protected]>
Cc: Bharath Rupireddy <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: Skipping schema changes in publication
Date: Tue, 10 Feb 2026 22:02:50 -0800
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On Tuesday, February 10, 2026, shveta malik <[email protected]> wrote:
> >
> > The attached v42 version patch has the changes for the same.
> >
>
> Thanks, will review.
>
Publication names are unique within the database. In
check_publications_except_list, the use of “select distinct” when pulling
from pg_publication by name is unnecessary. Furthermore, if we only have a
single publication name it is unnecessary to perform the check and thus no
need to even run the query.
David J.
+check_publications_except_list(WalReceiverConn *wrconn, List *publications)
+{
+ WalRcvExecResult *res;
+ StringInfoData cmd;
+ TupleTableSlot *slot;
+ Oid tableRow[1] = {TEXTOID};
+ List *except_publications = NIL;
+
+ initStringInfo(&cmd);
+ appendStringInfoString(&cmd,
+ "SELECT DISTINCT p.pubname\n"
+ " FROM pg_catalog.pg_publication p\n"
+ " WHERE p.pubname IN (");
+
+ GetPublicationsStr(publications, &cmd, true);
+
+ appendStringInfoString(&cmd,
+ ")\n"
+ " AND EXISTS (SELECT 1\n"
+ " FROM pg_catalog.pg_publication_rel pr\n"
+ " WHERE pr.prpubid = p.oid\n"
+ " AND pr.prexcept IS TRUE)");
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Subject: Re: Skipping schema changes in publication
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