'Column access returns REFERENCE to data'

@pytest.mark.parametrize('idx', [1, np.int64(1), np.array(1)])
def test_column(self, table_data, idx):

    self.t = table_data.Table(table_data.COLS)
    self.tc = self.t.columns
    a = self.t['a']
    assert (a[idx] == 2)
    a[idx] = 0
    assert (self.t['a'][idx] == 0)
