Relate, Compute By, and Sort operations cannot be performed on column(s) whose defined size is unknown or too large.

The Error "Relate, Compute By, and Sort operations cannot be performed on column(s) whose defined size is unknown or too large." appears when running a report/query in the Scheduler. 

This error can arise when a scheduled report is run where an filed in the sort orders, ( i.e, used in a group by of a report )  is set to a value larger than 254

The current Work-around is to change the value in the Analytics Engine , then remove and re-add the columns to the thew query.