Function parquet::column::writer::get_typed_column_writer

pub fn get_typed_column_writer<T: DataType>(
    col_writer: ColumnWriter
) -> ColumnWriterImpl<T>

Gets a typed column writer for the specific type T, by "up-casting" col_writer of non-generic type to a generic column writer type ColumnWriterImpl.

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