public Builder mergeExecutionStartingRequest(main.Messages.ExecutionStartingRequest value) {
        if (executionStartingRequestBuilder_ == null) {
          if (((bitField0_ & 0x00000004) == 0x00000004) &&
              executionStartingRequest_ != main.Messages.ExecutionStartingRequest.getDefaultInstance()) {
            executionStartingRequest_ =
              main.Messages.ExecutionStartingRequest.newBuilder(executionStartingRequest_).mergeFrom(value).buildPartial();
          } else {
            executionStartingRequest_ = value;
          }
          onChanged();
        } else {
          executionStartingRequestBuilder_.mergeFrom(value);
        }
        bitField0_ |= 0x00000004;
        return this;
      }