presto-main/src/main/java/io/prestosql/operator/JoinBridgeManager.java/OneToOneInternalJoinBridgeDataManager/getOuterPositionsFuture
class OneToOneInternalJoinBridgeDataManager:        @Override
        public ListenableFuture<OuterPositionIterator> getOuterPositionsFuture(Lifespan lifespan)
        {
            return transform(
                    data(lifespan).joinLifecycle.whenBuildAndProbeFinishes(),
                    ignored -> data(lifespan).joinBridge.getOuterPositionIterator(), directExecutor());
        }