How to view the original script of a materialized view?
You can use the function dbms_metadata.get_ddl:
select dbms_metadata.get_ddl('MATERIALIZED_VIEW', 'MVIEW_NAME') from dual;
select query from user_mviews where mview_name = 'your materialized view';
I ended up running:
select * from all_mviews where mview_name = ‘YOUR_MV_NAME’;