def importHelper(self, struct):
        m = StrStrHashMap()
        keysAndValues = struct.get(self.__field)
        for i in range(0, len(keysAndValues), 2):
            m[keysAndValues[i]] = keysAndValues[i+1]
        return m
def test_impl(df):
            A = df.A.str.split(',')
            B = pd.Series(list(itertools.chain(*A)))
            return B