RFR: JDK-8205461 Create Collector which merges results of two other collectors

[Peter Levart]

Hi Stuart,

On 08/21/2018 07:43 AM, Stuart Marks wrote:
> 2. Characteristics
>
>  - UNORDERED: should the returned collector be UNORDERED if *either* 
> of the provided collectors is UNORDERED? (Current draft says *both*.)

I think *both* is the right behavior. If you are collecting:

     teeingAndThen(
         Collectors.toList(),
         Collectors.toSet(),
         Map::entry
     )

...then you might want the returned List part of result to respect 
encounter order regardless of the returned Set part which doesn't.


Regards, Peter