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https://issues.apache.org/jira/browse/BEAM-7358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17122035#comment-17122035
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Kenneth Knowles commented on BEAM-7358:
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This issue is assigned but has not received an update in 30 days so it has been
labeled "stale-assigned". If you are still working on the issue, please give an
update and remove the label. If you are no longer working on the issue, please
unassign so someone else may work on it. In 7 days the issue will be
automatically unassigned.
> 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
> Assignee: Hyu Naoki
> Priority: P2
> Labels: stale-assigned
>
> 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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