code: func MutRowFromDatums(datums []types.Datum) MutRow {
  	c := &Chunk{columns: make([]*column, 0, len(datums))}
  	for _, d := range datums {
  		col := makeMutRowColumn(d.GetValue())
  		c.columns = append(c.columns, col)
  	}
  	return MutRow{c: c, idx: 0}
  }
docs: // MutRowFromDatums creates a MutRow from a datum slice.