Handle sequences in preprocess_pubobj_list

Commit 75b1521dae added support for logical replication of sequences,
including grammar changes, but it did not update preprocess_pubobj_list
accordingly. This can cause segfaults with "continuations", i.e. when
command specifies a list of objects:

  CREATE PUBLICATION p FOR SEQUENCE s1, s2;

Reported by Amit Kapila, patch by me.

Reported-by: Amit Kapila
Discussion: https://postgr.es/m/CAA4eK1JxDNKGBSNTyN-Xj2JRjzFo+ziSqJbjH==vuO0YF_CQrg@mail.gmail.com

src/backend/parser/gram.y

@@ -17493,7 +17493,8 @@ preprocess_pubobj_list(List *pubobjspec_list, core_yyscan_t yyscanner)
 		if (pubobj->pubobjtype == PUBLICATIONOBJ_CONTINUATION)
 			pubobj->pubobjtype = prevobjtype;
 
-		if (pubobj->pubobjtype == PUBLICATIONOBJ_TABLE)
+		if (pubobj->pubobjtype == PUBLICATIONOBJ_TABLE ||
+			pubobj->pubobjtype == PUBLICATIONOBJ_SEQUENCE)
 		{
 			/* relation name or pubtable must be set for this type of object */
 			if (!pubobj->name && !pubobj->pubtable)
@@ -17537,6 +17538,30 @@ preprocess_pubobj_list(List *pubobjspec_list, core_yyscan_t yyscanner)
 						errmsg("invalid schema name at or near"),
 						parser_errposition(pubobj->location));
 		}
+		else if (pubobj->pubobjtype == PUBLICATIONOBJ_SEQUENCES_IN_SCHEMA ||
+				 pubobj->pubobjtype == PUBLICATIONOBJ_SEQUENCES_IN_CUR_SCHEMA)
+		{
+			/* WHERE clause is not allowed on a schema object */
+			if (pubobj->pubtable && pubobj->pubtable->whereClause)
+				ereport(ERROR,
+						errcode(ERRCODE_SYNTAX_ERROR),
+						errmsg("WHERE clause not allowed for schema"),
+						parser_errposition(pubobj->location));
+
+			/*
+			 * We can distinguish between the different type of schema
+			 * objects based on whether name and pubtable is set.
+			 */
+			if (pubobj->name)
+				pubobj->pubobjtype = PUBLICATIONOBJ_SEQUENCES_IN_SCHEMA;
+			else if (!pubobj->name && !pubobj->pubtable)
+				pubobj->pubobjtype = PUBLICATIONOBJ_SEQUENCES_IN_CUR_SCHEMA;
+			else
+				ereport(ERROR,
+						errcode(ERRCODE_SYNTAX_ERROR),
+						errmsg("invalid schema name at or near"),
+						parser_errposition(pubobj->location));
+		}
 
 		prevobjtype = pubobj->pubobjtype;
 	}

src/test/regress/expected/publication.out

@@ -319,6 +319,24 @@ Publications:
 
 DROP SEQUENCE testpub_seq0, pub_test.testpub_seq1, testpub_seq2;
 DROP PUBLICATION testpub_forallsequences, testpub_forsequence, testpub_forschema;
+-- publication testing multiple sequences at the same time
+CREATE SEQUENCE testpub_seq1;
+CREATE SEQUENCE testpub_seq2;
+SET client_min_messages = 'ERROR';
+CREATE PUBLICATION testpub_multi FOR SEQUENCE testpub_seq1, testpub_seq2;
+RESET client_min_messages;
+\dRp+ testpub_multi
+                                               Publication testpub_multi
+          Owner           | All tables | All sequences | Inserts | Updates | Deletes | Truncates | Sequences | Via root 
+--------------------------+------------+---------------+---------+---------+---------+-----------+-----------+----------
+ regress_publication_user | f          | f             | t       | t       | t       | t         | t         | f
+Sequences:
+    "public.testpub_seq1"
+    "public.testpub_seq2"
+
+DROP PUBLICATION testpub_multi;
+DROP SEQUENCE testpub_seq1;
+DROP SEQUENCE testpub_seq2;
 -- Publication mixing tables and sequences
 SET client_min_messages = 'ERROR';
 CREATE PUBLICATION testpub_mix;

src/test/regress/sql/publication.sql

@@ -167,6 +167,22 @@ SELECT pubname, puballtables, puballsequences FROM pg_publication WHERE pubname
 DROP SEQUENCE testpub_seq0, pub_test.testpub_seq1, testpub_seq2;
 DROP PUBLICATION testpub_forallsequences, testpub_forsequence, testpub_forschema;
 
+
+-- publication testing multiple sequences at the same time
+CREATE SEQUENCE testpub_seq1;
+CREATE SEQUENCE testpub_seq2;
+
+SET client_min_messages = 'ERROR';
+CREATE PUBLICATION testpub_multi FOR SEQUENCE testpub_seq1, testpub_seq2;
+RESET client_min_messages;
+
+\dRp+ testpub_multi
+
+DROP PUBLICATION testpub_multi;
+DROP SEQUENCE testpub_seq1;
+DROP SEQUENCE testpub_seq2;
+
+
 -- Publication mixing tables and sequences
 SET client_min_messages = 'ERROR';
 CREATE PUBLICATION testpub_mix;