code: func (crs *CopRuntimeStats) RecordOneCopTask(address string, summary *tipb.ExecutorExecutionSummary) {
  	crs.Lock()
  	defer crs.Unlock()
  	crs.stats[address] = append(crs.stats[address],
  		&RuntimeStats{int32(*summary.NumIterations), int64(*summary.TimeProcessedNs), int64(*summary.NumProducedRows)})
  }
docs: // RecordOneCopTask records a specific cop tasks's execution detail.