Github user zuyu commented on a diff in the pull request:

    https://github.com/apache/incubator-quickstep/pull/234#discussion_r112400291
  
    --- Diff: relational_operators/UnionAllOperator.cpp ---
    @@ -128,14 +128,56 @@ bool UnionAllOperator::getAllWorkOrders(
     }
     
     bool UnionAllOperator::getAllWorkOrderProtos(WorkOrderProtosContainer* 
container) {
    -  // TODO(tianrun): Add protobuf for UnionAllWorkOrder to support 
distributed mode.
    -  LOG(FATAL) << "UnionAllOperator is not supported in distributed mode 
yet.";
    -  return true;
    +  if (!stored_generated_) {
    +    for (std::size_t relation_index = 0; relation_index < 
input_relations_.size(); ++relation_index) {
    --- End diff --
    
    Not necessary.


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