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

    https://github.com/apache/incubator-quickstep/pull/69#discussion_r72703912
  
    --- Diff: query_execution/QueryManagerDistributed.cpp ---
    @@ -119,6 +119,27 @@ bool 
QueryManagerDistributed::fetchNormalWorkOrders(const dag_node_index index)
       return generated_new_workorder_protos;
     }
     
    +void QueryManagerDistributed::processInitiateRebuildResponseMessage(const 
dag_node_index op_index,
    +                                                                    const 
std::size_t num_rebuild_work_orders) {
    +  // TODO(zuyu): Multiple workers support.
    +  query_exec_state_->setRebuildStatus(op_index, num_rebuild_work_orders, 
true);
    +
    +  if (num_rebuild_work_orders != 0u) {
    +    // Wait for the rebuild work orders to finish.
    +    return;
    +  }
    +
    +  markOperatorFinished(op_index);
    --- End diff --
    
    Yes, `num_rebuild_work_orders` is zero.


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