presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/storage/OrcPageSource.java/BucketNumberColumn/BucketNumberColumn
class BucketNumberColumn:        public BucketNumberColumn(int bucketNumber)
        {
            BlockBuilder blockBuilder = INTEGER.createFixedSizeBlockBuilder(1);
            INTEGER.writeLong(blockBuilder, bucketNumber);
            this.bucketNumberBlock = blockBuilder.build();
        }