static Lookup noLookup() {
    return node -> {
      throw new UnsupportedOperationException();
    };
  }
A Lookup implementation that does not perform lookup. It satisfies contract by rejecting {@link
GroupReference}-s.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/planner/iterative/Lookup.java