Is there a way to get the total rows and set rowNum before the grid is actually rendered? Picking an arbitrary number like 100 is fine for queries returning less than 100 records, but once those go over the rowNum limit no more records are displayed (without paging or dynamic scrolling etc).

The JSON response contains the total number of records contained in the results set, is there a way to read this and use that value to set rowNum so the grid can always display the total number of records without hitting a hard limit?