pg_upgrade: Ignore TOAST for partitioned tables

Since partitioned tables in pg12 do not have toast tables, trying to set
the toast OID confuses pg_upgrade.  Have pg_dump omit those values to
avoid the problem.

Per Andres Freund and buildfarm members crake and snapper
Discussion: https://postgr.es/m/20190306204104.yle5jfbnqkcwykni@alap3.anarazel.de

Author: alvherre

src/bin/pg_dump/pg_dump.c

@@ -4354,14 +4354,20 @@ binary_upgrade_set_type_oids_by_rel_oid(Archive *fout,
 	Oid			pg_type_oid;
 	bool		toast_set = false;
 
-	/* we only support old >= 8.3 for binary upgrades */
+	/*
+	 * We only support old >= 8.3 for binary upgrades.
+	 *
+	 * We purposefully ignore toast OIDs for partitioned tables; the reason is
+	 * that versions 10 and 11 have them, but 12 does not, so emitting them
+	 * causes the upgrade to fail.
+	 */
 	appendPQExpBuffer(upgrade_query,
 					  "SELECT c.reltype AS crel, t.reltype AS trel "
 					  "FROM pg_catalog.pg_class c "
 					  "LEFT JOIN pg_catalog.pg_class t ON "
-					  "  (c.reltoastrelid = t.oid) "
+					  "  (c.reltoastrelid = t.oid AND c.relkind <> '%c') "
 					  "WHERE c.oid = '%u'::pg_catalog.oid;",
-					  pg_rel_oid);
+					  RELKIND_PARTITIONED_TABLE, pg_rel_oid);
 
 	upgrade_res = ExecuteSqlQueryForSingleRow(fout, upgrade_query->data);
 
@@ -5953,6 +5959,10 @@ getTables(Archive *fout, int *numTables)
 	 * information about each table, basically just enough to decide if it is
 	 * interesting. We must fetch all tables in this phase because otherwise
 	 * we cannot correctly identify inherited columns, owned sequences, etc.
+	 *
+	 * We purposefully ignore toast OIDs for partitioned tables; the reason is
+	 * that versions 10 and 11 have them, but 12 does not, so emitting them
+	 * causes the upgrade to fail.
 	 */
 
 	if (fout->remoteVersion >= 90600)
@@ -6049,7 +6059,7 @@ getTables(Archive *fout, int *numTables)
 						  "d.classid = c.tableoid AND d.objid = c.oid AND "
 						  "d.objsubid = 0 AND "
 						  "d.refclassid = c.tableoid AND d.deptype IN ('a', 'i')) "
-						  "LEFT JOIN pg_class tc ON (c.reltoastrelid = tc.oid) "
+						  "LEFT JOIN pg_class tc ON (c.reltoastrelid = tc.oid AND c.relkind <> '%c') "
 						  "LEFT JOIN pg_am am ON (c.relam = am.oid) "
 						  "LEFT JOIN pg_init_privs pip ON "
 						  "(c.oid = pip.objoid "
@@ -6072,6 +6082,7 @@ getTables(Archive *fout, int *numTables)
 						  ispartition,
 						  partbound,
 						  RELKIND_SEQUENCE,
+						  RELKIND_PARTITIONED_TABLE,
 						  RELKIND_RELATION, RELKIND_SEQUENCE,
 						  RELKIND_VIEW, RELKIND_COMPOSITE_TYPE,
 						  RELKIND_MATVIEW, RELKIND_FOREIGN_TABLE,