public SortPartitionOperator < T > sortPartition ( int field , Order order ) { if ( useKeySelector ) { throw new InvalidProgramException ( "Expression keys cannot be appended after a KeySelector" ) ; } ensureSortableKey ( field ) ; keys . add ( new Keys . ExpressionKeys <> ( field , getType ( ) ) ) ; orders . add ( order ) ; return this ; }
Appends an additional sort order with the specified field in the specified order to the local partition sorting of the DataSet .