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From "Matthias J. Sax" <mj...@informatik.hu-berlin.de>
Subject Re: Tuple
Date Sat, 01 Aug 2015 11:04:46 GMT
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.


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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