presto-main/src/main/java/io/prestosql/operator/ArrayPositionLinks.java/FactoryBuilder/build
class FactoryBuilder:        @Override
        public PositionLinks.Factory build()
        {
            return new PositionLinks.Factory()
            {
                @Override
                public PositionLinks create(List<JoinFilterFunction> searchFunctions)
                {
                    return new ArrayPositionLinks(positionLinks);
                }

                @Override
                public long checksum()
                {
                    return XxHash64.hash(Slices.wrappedIntArray(positionLinks));
                }
            };
        }