Data frames have different column structure.
Wrong column type for field b actual: float64; expected: int64)
Compare with:
    diff /var/folders/2y/72gfd2691h9gf2cy48xp8slh0000gn/T/actual-df002.parquet /var/folders/2y/72gfd2691h9gf2cy48xp8slh0000gn/T/expected-df002.parquet
