Is there any actual conversion implementation for arrow and parquet?

We found that there are only schema conversions under the parqeut-arrow, so we wanted to ask if there is any code that includes the actual data conversions between parquet and arrow.

Start by inspecting the schema-conversion code under parqeut-arrow and trace whether any data conversion entry points exist for Parquet and Arrow. Determine whether actual data conversion is implemented; done means documenting the existing coverage or defining the missing implementation scope.

Written by the indexing model from the issue text.