Function parquet::arrow::parquet_to_arrow_schema_by_root_columns

pub fn parquet_to_arrow_schema_by_root_columns<T>(
    parquet_schema: &SchemaDescriptor, 
    column_indices: T, 
    key_value_metadata: &Option<Vec<KeyValue>>
) -> Result<Schema> where
    T: IntoIterator<Item = usize>, 

Convert parquet schema to arrow schema including optional metadata, only preserving some root columns. This is useful if we have columns a.b, a.c.e and a.d, and want a with all its child fields