presto-main/src/main/java/io/prestosql/operator/LookupJoinOperator.java/SavedRow/SavedRow
class SavedRow:        public SavedRow(Page page, int position, long joinPositionWithinPartition, boolean currentProbePositionProducedRow, int joinSourcePositions)
        {
            this.row = page.getSingleValuePage(position);

            this.joinPositionWithinPartition = joinPositionWithinPartition;
            this.currentProbePositionProducedRow = currentProbePositionProducedRow;
            this.joinSourcePositions = joinSourcePositions;
        }