presto-kudu/src/main/java/io/prestosql/plugin/kudu/KuduUpdatablePageSource.java/KuduUpdatablePageSource/finish
class KuduUpdatablePageSource:    @Override
    public CompletableFuture<Collection<Slice>> finish()
    {
        CompletableFuture<Collection<Slice>> cf = new CompletableFuture<>();
        cf.complete(Collections.emptyList());
        return cf;
    }