presto-main/src/main/java/io/prestosql/operator/SpilledLookupSourceHandle.java/SpilledLookupSourceHandle/getUnspillingOrDisposeRequested
class SpilledLookupSourceHandle:    public ListenableFuture<?> getUnspillingOrDisposeRequested()
    {
        return unspillingOrDisposeRequested;
    }