we have a vertex and below query we are trying to find all RFS with name as null, it is working fine.
result = select rfs from RFS:rfs where rfs.name == “”;
But for the same check on indexed attribute cust_id it is not giving results even though the value is empty. cust_id is indexed
result = select rfs from RFS:rfs where rfs.cust_id== “”;
Please help how to write null check on indexed attribute.