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-rw-r--r--contrib/pg_upgrade/info.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/contrib/pg_upgrade/info.c b/contrib/pg_upgrade/info.c
index 22504427065..11ceb705676 100644
--- a/contrib/pg_upgrade/info.c
+++ b/contrib/pg_upgrade/info.c
@@ -61,6 +61,9 @@ gen_db_file_maps(DbInfo *old_db, DbInfo *new_db,
* 9.0, TOAST relation names always use heap table oids, hence we
* cannot check relation names when upgrading from pre-9.0. Clusters
* upgraded to 9.0 will get matching TOAST names.
+ * If index names don't match primary key constraint names, this will
+ * fail because pg_dump dumps constraint names and pg_upgrade checks
+ * index names.
*/
if (strcmp(old_rel->nspname, new_rel->nspname) != 0 ||
((GET_MAJOR_VERSION(old_cluster.major_version) >= 900 ||