presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/RaptorColumnHandle.java/RaptorColumnHandle/bucketNumberColumnHandle
class RaptorColumnHandle:    public static RaptorColumnHandle bucketNumberColumnHandle()
    {
        return new RaptorColumnHandle(BUCKET_NUMBER_COLUMN_NAME, BUCKET_NUMBER_COLUMN_ID, INTEGER);
    }