public static Expression<Long> count(Expression<?> source) {
        return operation(Long.class, Ops.AggOps.COUNT_AGG, source);
    }
public static Expression < Long > count ( Expression < ? > source ) { return operation ( Long . class , Ops . AggOps . COUNT_AGG , source ) ; }
Create a {@code count(source)} expression

@param source source
@return count(source)