presto-orc/src/main/java/io/prestosql/orc/OrcWriteValidation.java/OrcWriteValidation/WriteChecksumBuilder
class OrcWriteValidation:        private WriteChecksumBuilder(List<Type> types)
        {
            this.types = ImmutableList.copyOf(requireNonNull(types, "types is null"));

            ImmutableList.Builder<XxHash64> columnHashes = ImmutableList.builder();
            for (Type ignored : types) {
                columnHashes.add(new XxHash64());
            }
            this.columnHashes = columnHashes.build();
        }