title: How can I write Option Distinct on Grid
body: <p>I'd like to display the data on grid.</p>
  
  <p>There are data that have columns such as order id, product id, customer id, store id and order date.
  These all are unique data except order date.</p>
  
  <p>I'd like to display only a row when order dates are same.
  And I'd like to display rows when order dates are not.</p>
  
  <p>I'm thinking that Option Distinct could be possible it.
  Is it truely possible?
  Or there's a better way? </p>