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Date: Thu, 12 Jun 2014 00:46:14 -0700 (PDT)
From: Vyacheslav Zholudev <vyacheslav.zholudev@gmail.com>
To: stratosphere-dev@googlegroups.com
Cc: dev@flink.incubator.apache.org, rmetzger@apache.org
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Subject: Re: [stratosphere-dev] Grouping by a tuple
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Hi Robert,

thanks, I will post my future questions to that list.

Regarding your question: When using the Tuples, you don't need to specify a 
> keySelector. It is sufficient to specify the ID(s) of the keys: 
> http://stratosphere-javadocs.github.io/eu/stratosphere/api/java/DataSet.html#groupBy(int..
> .)
> So you should be able to do a ".groupBy(0,3,4)"
>
>
Actually my question is about the situation when I don't have tuples. 
Assume I have a DataSet<UserData> ds and I want to invoke ds.groupBy(/* 
grouping by <userId, sessionId, dayOfTheYear> */), the ideal choice would 
be to return a comparable tuple from the KeySelector.
On the side note, would it be possible to generate the clone method for the 
tuples? Yesterday I was copying a Tuple13 in a groupReduce function by hand 
and it was a pretty long line of code :)

Thanks,
Vyacheslav

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<div dir=3D"ltr">Hi Robert,<div><br></div><div>thanks, I will post my futur=
e questions to that list.<br><br><blockquote class=3D"gmail_quote" style=3D=
"margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex=
;"><div dir=3D"ltr"><div><div>Regarding your question: When using the Tuple=
s, you don't need to specify a keySelector. It is sufficient to specify the=
 ID(s) of the keys:&nbsp;<a href=3D"http://stratosphere-javadocs.github.io/=
eu/stratosphere/api/java/DataSet.html#groupBy(int.." target=3D"_blank" onmo=
usedown=3D"this.href=3D'http://www.google.com/url?q\75http%3A%2F%2Fstratosp=
here-javadocs.github.io%2Feu%2Fstratosphere%2Fapi%2Fjava%2FDataSet.html%23g=
roupBy(int..\46sa\75D\46sntz\0751\46usg\75AFQjCNGv56jr8kjFpqDrJyt0NgTnX5F3O=
g';return true;" onclick=3D"this.href=3D'http://www.google.com/url?q\75http=
%3A%2F%2Fstratosphere-javadocs.github.io%2Feu%2Fstratosphere%2Fapi%2Fjava%2=
FDataSet.html%23groupBy(int..\46sa\75D\46sntz\0751\46usg\75AFQjCNGv56jr8kjF=
pqDrJyt0NgTnX5F3Og';return true;">http://stratosphere-<wbr>javadocs.github.=
io/eu/<wbr>stratosphere/api/java/DataSet.<wbr>html#groupBy(int..</a>.)</div=
>

<div>So you should be able to do a ".groupBy(0,3,4)"</div><div><br></div></=
div></div></blockquote><div><br></div><div>Actually my question is about th=
e situation when I don't have tuples. Assume I have a DataSet&lt;UserData&g=
t; ds and I want to invoke ds.groupBy(/* grouping by &lt;userId, sessionId,=
 dayOfTheYear&gt; */), the ideal choice would be to return a comparable tup=
le from the KeySelector.</div></div><div>On the side note, would it be poss=
ible to generate the clone method for the tuples? Yesterday I was copying a=
 Tuple13 in a groupReduce function by hand and it was a pretty long line of=
 code :)</div><div><br></div><div>Thanks,</div><div>Vyacheslav</div></div>
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