Document why pg_upgrade preserves pg_auth.oid (because they are stored

in pg_largeobject_metadata).

diff --git a/contrib/pg_upgrade/pg_upgrade.c b/contrib/pg_upgrade/pg_upgrade.c
index 42da3ea0df70da29ccbbd0832875ecb80eab329b..331ade1076f6b33818c3baff965b1368f46d46ff 100644 (file)
--- a/contrib/pg_upgrade/pg_upgrade.c
+++ b/contrib/pg_upgrade/pg_upgrade.c
@@ -28,6 +28,9 @@
  *
  * We control all assignments of pg_enum.oid because these oids are stored
  * in user tables as enum values.
+ *
+ * We control all assignments of pg_auth.oid because these oids are stored
+ * in pg_largeobject_metadata.
  */