more on streaming-resultset-retrieval/

I don't see how to reply to the comment I see at https://mariadb.com/kb/en/streaming-resultset-retrieval/ so I'm using the ask a question form again (Also, is there some way to be informed by email when someone answers this question?)

I've tried both php and java, following the instructions in the link that was mentioned, and so far in every case I get ALL of the results reported at the end, My impression so far is that this facility is NOT about reporting results as they are found, but about not storing them in the client memory all at the same time, I'm still looking for any evidence that a result can come back before all of the results have been computed on the server.