Returns the data contained in this part in the form of an Observable that a subscriber can subscribe to.
Returns the data contained in this part in the form of an Observable that a subscriber can subscribe to. This function should createReader a clean rows on each invocation. By clean, we mean that each seperate rows should provide the full set of data contained in the part, in a thread safe manner. Ie, it should be possible to invoke this method k times, and subscribe to those k observables concurrently, and each rows should emit the same data.