This is a pretty central question, actually (timestamping the results of
windows). Let us kick off a separate thread for this...
On Wed, May 13, 2015 at 9:20 AM, Bruno Cadonna <
cado...@informatik.hu-berlin.de> wrote:
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> Hi,
>
> I think timestamping results of a time window operator is essential.
> Without timestamps in the results, it is not possible to execute two
> time window operators one after the other.
>
> Cheers,
> Bruno
>
> On 12.05.2015 18:30, Aljoscha Krettek wrote:
> > Hi, I'll try to make it quick this time. I think we need to make
> > information about the event time of an element and information
> > about windows in which it resides accessible to the user. A simple
> > example would be the aggregation of some user behaviour, for
> > example:
> >
> > in = clickSource()
> >
> > analysedData = in .window(10 minutes).every(5 minutes)
> > .groupBy("userId") .filter(is something interesting)
> > .sum("something")
> >
> > analysedData.storeToMySystem()
> >
> > Now the results of this window aggregation tell me that at some
> > point, there was some window and in this window some attribute
> > summed up to this. This might not be very helpful. What might be
> > helpful is the information that there occurred a spike in something
> > at 12:45 on Wednesday. Therefore, I think we need to make this
> > information available somehow.
> >
> > I only have some rough Ideas about how this might work, but I
> > would first like to discuss whether others even think this
> > necessary. So fire away...
> >
> > Cheers, Aljoscha
> >
>
> - --
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Dr. Bruno Cadonna
> Postdoctoral Researcher
>
> Databases and Information Systems
> Department of Computer Science
> Humboldt-Universität zu Berlin
>
> http://www.informatik.hu-berlin.de/~cadonnab
>
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