fix - cannot encode value Binary to term

[ceyhunkerti]

fixes #994

import polars as pl
df = pl.DataFrame({"image": [b'\x01\x02\x03']})
df.write_parquet("ok.parquet")
df = pl.DataFrame({"image": [{"bytes": b'\x01\x02\x03'}]})
df.write_parquet("bad.parquet")

iex(1)> Explorer.DataFrame.from_parquet!("bad.parquet")
#Explorer.DataFrame<
  Polars[1 x 1]
  image struct[1] [%{"bytes" => [1, 2, 3]}]
>

[josevalim]

Looks great! Can you please add a test as well? :) You should be able to write the parquet file using a binary series.

[philss]

Thanks for the PR, @ceyhunkerti! I made a fix for that in #996 returning the binary series , so I'm closing this one.