* if false, relacl is always set NULL
* allow_system_table_mods: true to allow creation in system namespaces
* is_internal: is this a system-generated catalog?
* if false, relacl is always set NULL
* allow_system_table_mods: true to allow creation in system namespaces
* is_internal: is this a system-generated catalog?
+ * relrewrite: link to original relation during a table rewrite
*
* Output parameters:
* typaddress: if not null, gets the object address of the new pg_type entry
*
* Output parameters:
* typaddress: if not null, gets the object address of the new pg_type entry