presto-main/src/main/java/io/prestosql/operator/index/IndexSourceOperator.java/IndexSourceOperator/IndexSourceOperatorFactory
class IndexSourceOperator:        public IndexSourceOperatorFactory(
                int operatorId,
                PlanNodeId sourceId,
                ConnectorIndex index,
                Function<RecordSet, RecordSet> probeKeyNormalizer)
        {
            this.operatorId = operatorId;
            this.sourceId = requireNonNull(sourceId, "sourceId is null");
            this.index = requireNonNull(index, "index is null");
            this.probeKeyNormalizer = requireNonNull(probeKeyNormalizer, "probeKeyNormalizer is null");
        }