Report from Antonin Houska
* relNode identifies the specific relation. relNode corresponds to
* pg_class.relfilenode (NOT pg_class.oid, because we need to be able
* to assign new physical files to relations in some situations).
- * Notice that relNode is only unique within a particular database.
+ * Notice that relNode is only unique within a particular tablespace.
*
* Note: spcNode must be GLOBALTABLESPACE_OID if and only if dbNode is
* zero. We support shared relations only in the "global" tablespace.