title: How to access a cell value when the column has been defined with ag-grid expression/value getters?
body: <p>If the <em>ag-grid</em> column definition has been defined with a value getter or if an expression has been defined for a cell the value gets displayed fine on the grid. However I was not able to find a way to access a value in a given cell if the cell is using cell expression/value getters. Was trying to access the data through <code>api.forEachLeafNode</code>, but it seems even the in memory model does not have this data. The only way I found was to export the data as CSV and then parse it using <code>getDataAsCsv(params)</code>. </p>
  
  <p>Is exporting the data the only way to access value of a column in a grid with a value getter?</p>
  
  <p>Why does the In Memory model not have this data to access?</p>