@udf_map(produces=['ucase_lhs2', 'rhs2'])
def upper_case(tuple):
    return [tuple.get('lhs2').upper(), tuple.get('rhs2')]
Return the upper case of the 'lhs2' column, and the 'rhs2' column
dataset/ETHPy150Open twitter/pycascading/examples/joins.py/upper_case