presto-orc/src/main/java/io/prestosql/orc/OrcWriteValidation.java/WriteChecksumBuilder/build
class WriteChecksumBuilder:        public WriteChecksum build()
        {
            return new WriteChecksum(
                    totalRowCount,
                    stripeHash.hash(),
                    columnHashes.stream()
                            .map(XxHash64::hash)
                            .collect(toImmutableList()));
        }