public Builder clearExecutionStartingRequest() {
        if (executionStartingRequestBuilder_ == null) {
          executionStartingRequest_ = main.Messages.ExecutionStartingRequest.getDefaultInstance();
          onChanged();
        } else {
          executionStartingRequestBuilder_.clear();
        }
        bitField0_ = (bitField0_ & ~0x00000004);
        return this;
      }