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https://issues.apache.org/jira/browse/BEAM-7358?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Beam JIRA Bot updated BEAM-7358:
--------------------------------
Labels: (was: stale-P2)
> 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: P3
>
> 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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