presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/storage/OrcPageSource.java/OrcPageSource/bucketNumberColumn
class OrcPageSource:        static ColumnAdaptation bucketNumberColumn(OptionalInt bucketNumber)
        {
            if (!bucketNumber.isPresent()) {
                return nullColumn(INTEGER);
            }
            return new BucketNumberColumn(bucketNumber.getAsInt());
        }