Function parquet::column::reader::get_typed_column_reader

pub fn get_typed_column_reader<T: DataType>(
    col_reader: ColumnReader
) -> ColumnReaderImpl<T>

Gets a typed column reader for the specific type T, by "up-casting" col_reader of non-generic type to a generic column reader type ColumnReaderImpl.

NOTE: the caller MUST guarantee that the actual enum value for col_reader matches the type T. Otherwise, disastrous consequence could happen.