code: func (r *RegionFrameRange) GetRecordFrame(tableID int64, dbName, tableName string) *FrameItem {
  	if tableID == r.First.TableID && r.First.IsRecord {
  		r.First.DBName, r.First.TableName = dbName, tableName
  		return r.First
  	}
  	if tableID == r.Last.TableID && r.Last.IsRecord {
  		r.Last.DBName, r.Last.TableName = dbName, tableName
  		return r.Last
  	}
  
  	if tableID >= r.First.TableID && tableID < r.Last.TableID {
  		return &FrameItem{
  			DBName:    dbName,
  			TableName: tableName,
  			TableID:   tableID,
  			IsRecord:  true,
  		}
  	}
  	return nil
  }
docs: // GetRecordFrame returns the record frame of a table. If the table's records
  // are not covered by this frame range, it returns nil.