Add decoding of sequences to built-in replication

This commit adds support for decoding of sequences to the built-in
replication (the infrastructure was added by commit 0da92dc530).

The syntax and behavior mostly mimics handling of tables, i.e. a
publication may be defined as FOR ALL SEQUENCES (replicating all
sequences in a database), FOR ALL SEQUENCES IN SCHEMA (replicating
all sequences in a particular schema) or individual sequences.

To publish sequence modifications, the publication has to include
'sequence' action. The protocol is extended with a new message,
describing sequence increments.

A new system view pg_publication_sequences lists all the sequences
added to a publication, both directly and indirectly. Various psql
commands (\d and \dRp) are improved to also display publications
including a given sequence, or sequences included in a publication.

Author: Tomas Vondra, Cary Huang
Reviewed-by: Peter Eisentraut, Amit Kapila, Hannu Krosing, Andres
             Freund, Petr Jelinek
Discussion: https://postgr.es/m/d045f3c2-6cfb-06d3-5540-e63c320df8bc@enterprisedb.com
Discussion: https://postgr.es/m/1710ed7e13b.cd7177461430746.3372264562543607781@highgo.ca

1 files changed, 26 insertions, 1 deletions

diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 80faae985e9..124b9961dc9 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -42,6 +42,7 @@
 #include "catalog/pg_inherits.h"
 #include "catalog/pg_namespace.h"
 #include "catalog/pg_opclass.h"
+#include "catalog/pg_publication_namespace.h"
 #include "catalog/pg_statistic_ext.h"
 #include "catalog/pg_tablespace.h"
 #include "catalog/pg_trigger.h"
@@ -16381,11 +16382,14 @@ AlterTableNamespace(AlterObjectSchemaStmt *stmt, Oid *oldschema)
 	 * Check that setting the relation to a different schema won't result in a
 	 * publication having both a schema and the same schema's table, as this
 	 * is not supported.
+	 *
+	 * XXX We do this for tables and sequences, but it's better to keep the two
+	 * blocks separate, to make the strings easier to translate.
 	 */
 	if (stmt->objectType == OBJECT_TABLE)
 	{
 		ListCell   *lc;
-		List	   *schemaPubids = GetSchemaPublications(nspOid);
+		List	   *schemaPubids = GetSchemaPublications(nspOid, PUB_OBJTYPE_TABLE);
 		List	   *relPubids = GetRelationPublications(RelationGetRelid(rel));
 
 		foreach(lc, relPubids)
@@ -16403,6 +16407,27 @@ AlterTableNamespace(AlterObjectSchemaStmt *stmt, Oid *oldschema)
 								  get_publication_name(pubid, false)));
 		}
 	}
+	else if (stmt->objectType == OBJECT_SEQUENCE)
+	{
+		ListCell   *lc;
+		List	   *schemaPubids = GetSchemaPublications(nspOid, PUB_OBJTYPE_SEQUENCE);
+		List	   *relPubids = GetRelationPublications(RelationGetRelid(rel));
+
+		foreach(lc, relPubids)
+		{
+			Oid			pubid = lfirst_oid(lc);
+
+			if (list_member_oid(schemaPubids, pubid))
+				ereport(ERROR,
+						errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+						errmsg("cannot move sequence \"%s\" to schema \"%s\"",
+							   RelationGetRelationName(rel), stmt->newschema),
+						errdetail("The schema \"%s\" and same schema's sequence \"%s\" cannot be part of the same publication \"%s\".",
+								  stmt->newschema,
+								  RelationGetRelationName(rel),
+								  get_publication_name(pubid, false)));
+		}
+	}
 
 	/* common checks on switching namespaces */
 	CheckSetNamespace(oldNspOid, nspOid);