Reload each row is an option of the tMap. It has nothing to do with PostgreSQL and works with every lookup. The call to the globalMap are always Java code. To be able to help you you must show us the code which fails or the job design including the settings of the affected components. A call to the globalMap should looks like this: globalMap.get("your_key_as_string") or globalMap.put("your_key_as_string", anyvalue)
It is simple impossible after applying my suggestion to get the same error. If you want help, show the real error messages and the component configuration.