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Posted to issues@beam.apache.org by "Beam JIRA Bot (Jira)" <ji...@apache.org> on 2020/08/10 17:08:18 UTC
[jira] [Commented] (BEAM-7358) Developing "GroupByMultiKey"
[ https://issues.apache.org/jira/browse/BEAM-7358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17174722#comment-17174722 ]
Beam JIRA Bot commented on BEAM-7358:
-------------------------------------
This issue is P2 but has been unassigned without any comment for 60 days so it has been labeled "stale-P2". If this issue is still affecting you, we care! Please comment and remove the label. Otherwise, in 14 days the issue will be moved to P3.
Please see https://beam.apache.org/contribute/jira-priorities/ for a detailed explanation of what these priorities mean.
> Developing "GroupByMultiKey"
> -----------------------------
>
> Key: BEAM-7358
> URL: https://issues.apache.org/jira/browse/BEAM-7358
> Project: Beam
> Issue Type: New Feature
> Components: beam-model, sdk-ideas
> Reporter: Hyu Naoki
> Priority: P2
> Labels: stale-P2
>
> GroupByKey is useful, but it is difficult to express complex grouping conditions.
> I propose the development of the function to group if there is a common term in even one of multiple keys.
> Like this....
>
> usage
>
> {code:java}
> List io = Arrays.asList(
> KV.of(new MultiKey("A","C", "E"),"0"),
> KV.of(new MultiKey("A","D", "F"),"1"),
> KV.of(new MultiKey("B","D", "G"),"2"),
> KV.of(new MultiKey("H","J", "L"),"3"),
> KV.of(new MultiKey("I","K", "L"),"4"),
> KV.of(new MultiKey("M","C", "O"),"5"),
> KV.of(new MultiKey(null,null, "O"),"6"),
> KV.of(new MultiKey(null,null, null),"7")
> );
> p.apply(Create.of(io))
> .apply(GroupByMultiKey.create(3))
> .apply(new DebugPrintln());
> {code}
>
> out put this
> {quote}
> [KV\{["A","C","E"],"0"},KV\{["A","D","F"],"1"},KV\{["B","D","G"],"2"},KV\{["M","C","O"],"5"},KV\{[null,null,"O"],"6"}]
> [KV\{["H","J","L"],"3"},KV\{["I","K","L"],"4"}]
> [KV\{[null,null,null],"7"}]
>
> {quote}
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