Fix 9637badd9f.

Discussion: https://postgr.es/m/0a364430-266e-1e1a-d5d8-1a5273c9ddb6@dunslane.net
Reported-by: Andrew Dunstan

src/bin/pg_upgrade/info.c

@@ -311,11 +311,19 @@ get_template0_info(ClusterInfo *cluster)
 	int				 i_datctype;
 	int				 i_daticulocale;
 
-	dbres = executeQueryOrDie(conn,
-							  "SELECT encoding, datlocprovider, "
-							  "       datcollate, datctype, daticulocale "
-							  "FROM	pg_catalog.pg_database "
-							  "WHERE datname='template0'");
+	if (GET_MAJOR_VERSION(cluster->major_version) >= 1500)
+		dbres = executeQueryOrDie(conn,
+								  "SELECT encoding, datlocprovider, "
+								  "       datcollate, datctype, daticulocale "
+								  "FROM	pg_catalog.pg_database "
+								  "WHERE datname='template0'");
+	else
+		dbres = executeQueryOrDie(conn,
+								  "SELECT encoding, 'c' AS datlocprovider, "
+								  "       datcollate, datctype, NULL AS daticulocale "
+								  "FROM	pg_catalog.pg_database "
+								  "WHERE datname='template0'");
+
 
 	if (PQntuples(dbres) != 1)
 		pg_fatal("template0 not found");

src/bin/pg_upgrade/pg_upgrade.c

@@ -404,19 +404,30 @@ set_locale_and_encoding(void)
 		daticulocale_literal = pg_strdup("NULL");
 
 	/* update template0 in new cluster */
-	PQclear(executeQueryOrDie(conn_new_template1,
-							  "UPDATE pg_catalog.pg_database "
-							  "  SET encoding = %u, "
-							  "      datlocprovider = '%c', "
-							  "      datcollate = %s, "
-							  "      datctype = %s, "
-							  "      daticulocale = %s "
-							  "  WHERE datname = 'template0' ",
-							  locale->db_encoding,
-							  locale->db_collprovider,
-							  datcollate_literal,
-							  datctype_literal,
-							  daticulocale_literal));
+	if (GET_MAJOR_VERSION(new_cluster.major_version) >= 1500)
+		PQclear(executeQueryOrDie(conn_new_template1,
+								  "UPDATE pg_catalog.pg_database "
+								  "  SET encoding = %u, "
+								  "      datlocprovider = '%c', "
+								  "      datcollate = %s, "
+								  "      datctype = %s, "
+								  "      daticulocale = %s "
+								  "  WHERE datname = 'template0' ",
+								  locale->db_encoding,
+								  locale->db_collprovider,
+								  datcollate_literal,
+								  datctype_literal,
+								  daticulocale_literal));
+	else
+		PQclear(executeQueryOrDie(conn_new_template1,
+								  "UPDATE pg_catalog.pg_database "
+								  "  SET encoding = %u, "
+								  "      datcollate = %s, "
+								  "      datctype = %s "
+								  "  WHERE datname = 'template0' ",
+								  locale->db_encoding,
+								  datcollate_literal,
+								  datctype_literal));
 
 	PQfreemem(datcollate_literal);
 	PQfreemem(datctype_literal);

src/bin/pg_upgrade/t/002_pg_upgrade.pl

@@ -110,8 +110,12 @@ my $original_encoding = "6"; # UTF-8
 my $original_provider = "c";
 my $original_collate = "C";
 my $original_iculocale = "";
+my $provider_field = "'c' AS datlocprovider";
+my $iculocale_field = "NULL AS daticulocale";
 if ($oldnode->pg_version >= 15 && $ENV{with_icu} eq 'yes')
 {
+	$provider_field = "datlocprovider";
+	$iculocale_field = "daticulocale";
 	$original_provider = "i";
 	$original_iculocale = "fr-CA";
 }
@@ -132,8 +136,8 @@ $oldnode->start;
 
 my $result;
 $result = $oldnode->safe_psql(
-	'postgres', q{SELECT encoding, datlocprovider, datcollate, daticulocale
-                 FROM pg_database WHERE datname='template0'});
+	'postgres', "SELECT encoding, $provider_field, datcollate, $iculocale_field
+                 FROM pg_database WHERE datname='template0'");
 is($result, "$original_encoding|$original_provider|$original_collate|$original_iculocale",
 		"check locales in original cluster"
 	);
@@ -395,8 +399,8 @@ if (-d $log_path)
 
 # Test that upgraded cluster has original locale settings.
 $result = $newnode->safe_psql(
-	'postgres', q{SELECT encoding, datlocprovider, datcollate, datctype, daticulocale
-                 FROM pg_database WHERE datname='template0'});
+	'postgres', "SELECT encoding, $provider_field, datcollate, datctype, $iculocale_field
+                 FROM pg_database WHERE datname='template0'");
 is($result, "$original_encoding|$original_provider|$original_collate|$original_ctype|$original_iculocale",
 		"check that locales in new cluster match original cluster"
 	);