presto-main/src/main/java/io/prestosql/operator/PartitionedLookupSourceFactory.java/PartitionedLookupSourceFactory/isDestroyed
class PartitionedLookupSourceFactory:    @SuppressWarnings("FieldAccessNotGuarded")
    @Override
    public ListenableFuture<?> isDestroyed()
    {
        return nonCancellationPropagating(destroyed);
    }