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From Chesnay Schepler <chesnay.schep...@fu-berlin.de>
Subject Re: Tuple
Date Sat, 01 Aug 2015 11:30:49 GMT
yes, if it is present in the core flink files it must work just as any 
tuple in flink.

removing is not an option though; but moving is. The Python API uses it 
(that's the reason Tuple0 was added in the first place).

On 01.08.2015 13:04, Matthias J. Sax wrote:
> I see.
> I think that it might be useful to have Tuple0, because in rare cases,
> you only want to "notify" a downstream operators (taking about
> streaming) that something happened but there is no actual data to be
> processed. Furthermore, if Flink cannot deal with Tuple0 it should be
> removed completely for consistency IMHO.
> I will open a JIRA for it.
> -Matthias
> On 07/31/2015 10:44 PM, Chesnay Schepler wrote:
>> also, I'm not sure if I ever sent a Tuple0 through a program, it could
>> be that the system freaks out.
>> On 31.07.2015 22:40, Chesnay Schepler wrote:
>>> there's no specific reason. it was added fairly recently by me (mid of
>>> april), and you're most likely the second person to use it.
>>> i didn't integrate into all our tuple related stuff because, well, i
>>> never thought anyone would actually need it, so i saved myself the
>>> trouble.
>>>> Hi,
>>>> is there any specific reason, why Tuple.getTupleClass(int arity) does
>>>> not support arity zero? There is a class Tuple0, but it cannot be
>>>> generator by Tuple.getTupleClass(...). Is it a missing feature (I would
>>>> like to have it).
>>>> -Matthias

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