presto-main/src/main/java/io/prestosql/operator/WindowInfo.java/WindowInfo/IndexInfo
class WindowInfo:        public IndexInfo(long totalRowsCount, long sizeInBytes, double sumSquaredDifferencesSizeInPartition, long numberOfPartitions)
        {
            this.totalRowsCount = totalRowsCount;
            this.sizeInBytes = sizeInBytes;
            this.sumSquaredDifferencesSizeInPartition = sumSquaredDifferencesSizeInPartition;
            this.numberOfPartitions = numberOfPartitions;
        }