hg: lambda/lambda/jdk: - ensure null values are retained

[Remi Forax]

On 12/05/2012 10:44 AM, Paul Sandoz wrote:
> On Dec 4, 2012, at 3:12 PM, Remi Forax <forax at univ-mlv.fr> wrote:
>
>> On 12/04/2012 03:00 PM, Peter Levart wrote:
>>> Hi Remi, Paul,
>>>
>>> What about vice-versa:
>> Hi Peter,
>> good idea !
> +1

yes, I think two constants are needed, one is NO_VALUE and is used as 
init value to detect that an element is the first one because queries 
like findFirst or reduce does something different for the first element 
and null is a valid first element. The other is NULL_VALUE and is used 
only in the parallel code to mask null because concurrent collections 
doesn't support null but parallel stream supports null.

>
> Paul.

Rémi