Roundtrip flags with parquet

[gab23r]

Problem description

I wish I flags could roundtrip with parquet ex:

(
    pl.DataFrame({'A' : [1,2,3]})
    .with_columns(pl.col('A').set_sorted())
    .write_parquet('tmp.parquet')
)

pl.read_parquet('tmp.parquet')['A'].flags 
# Today: {'SORTED_ASC': False, 'SORTED_DESC': False}
# Wish: {'SORTED_ASC': True, 'SORTED_DESC': False}

[ancher1912]

This would indeed be a very nice feature.

[coastalwhite]

Part of this was addressed by #19251 and the other part will be addressed by #19263.