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-rw-r--r--src/bin/pg_upgrade/pg_upgrade.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/bin/pg_upgrade/pg_upgrade.c b/src/bin/pg_upgrade/pg_upgrade.c
index 72b5a5fde5a..d9db48dba0d 100644
--- a/src/bin/pg_upgrade/pg_upgrade.c
+++ b/src/bin/pg_upgrade/pg_upgrade.c
@@ -32,6 +32,9 @@
* We control all assignments of pg_authid.oid for historical reasons (the
* oids used to be stored in pg_largeobject_metadata, which is now copied via
* SQL commands), that might change at some point in the future.
+ *
+ * We control all assignments of pg_database.oid because we want the directory
+ * names to match between the old and new cluster.
*/