Emits a limit as <input>->limit(<size>), the input sorted first by its order when the context gives one (emitSortedInput). On a database whose engine plan numbers a limit's rows itself, by the first sort key only and in a column it always names row_number (Sybase IQ), it goes through Cube's row numbers (emitRowNumberRange), keeping those up to the size. The size is written as plain digits: the serializer would also accept a number token such as 1e3.