presto-main/src/main/java/io/prestosql/operator/JoinBridgeManager.java/JoinBridgeManager/outerOperatorFactoryClosed
class JoinBridgeManager:        @Override
        public void outerOperatorFactoryClosed(Lifespan lifespan)
        {
            checkArgument(Lifespan.taskWide().equals(lifespan));
            joinLifecycle.releaseForOuter();
        }