code: func (r *RetryInfo) Clean() {
  	r.currRetryOff = 0
  	if len(r.autoIncrementIDs) > 0 {
  		r.autoIncrementIDs = r.autoIncrementIDs[:0]
  	}
  	if len(r.DroppedPreparedStmtIDs) > 0 {
  		r.DroppedPreparedStmtIDs = r.DroppedPreparedStmtIDs[:0]
  	}
  }
docs: // Clean does some clean work.