presto-rcfile/src/main/java/io/prestosql/rcfile/RcFileWriteValidation.java/RcFileWriteValidation/WriteChecksum
class RcFileWriteValidation:        public WriteChecksum(long totalRowCount, long rowGroupHash, List<Long> columnHashes)
        {
            this.totalRowCount = totalRowCount;
            this.rowGroupHash = rowGroupHash;
            this.columnHashes = columnHashes;
        }