def METHOD_NAME():
    # this might be a duplicate or rename_test.py/test_reassign_virtual
    x = [1, 2, 3, 5, np.nan, -1, -7, 10]
    df = vaex.from_arrays(x=x)
    # create a virtual column that will have nans due to the calculations
    df['r'] = np.log(df.x)
    df['r'] = df.r.fillna(value=0xdeadbeef)
    np.testing.assert_almost_equal(df.r.tolist()[:4], [0.0, 0.6931471805599453, 1.0986122886681098, 1.6094379124341003])
    assert df.r.tolist()[4:7] == [0xdeadbeef, 0xdeadbeef, 0xdeadbeef]