col_a col_a_copy col_b col_c col_d col_e col_f bar_inverse col_h col_i col_g
0 nan nan nan NaT None nan 1.000000 1.000000 nan NaT nan
1 2.000000 2.000000 b 2021-01-02 00:00:00 nan nan 2.000000 2.000000 TestEnum.VALUE_A NaT b
2 3.000000 3.000000 d 2021-01-03 00:00:00 2021-04-02 nan 3.000000 3.000000 TestEnum.VALUE_B 2021-04-02 00:00:00 d
3 4.000000 4.000000 d 2021-01-04 00:00:00 2021-04-02 nan 4.000000 4.000000 TestEnum.VALUE_B 2021-04-02 00:00:00 d