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From "bakeypan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (BEAM-12) Apply GroupByKey transforms on PCollection of normal type other than KV
Date Sun, 14 Feb 2016 14:58:18 GMT

     [ https://issues.apache.org/jira/browse/BEAM-12?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

bakeypan updated BEAM-12:
-------------------------
    Summary: Apply GroupByKey transforms on PCollection of normal type other than KV  (was:
Apply GroupByKey transforms on PCollection)

> Apply GroupByKey transforms on PCollection of normal type other than KV
> -----------------------------------------------------------------------
>
>                 Key: BEAM-12
>                 URL: https://issues.apache.org/jira/browse/BEAM-12
>             Project: Beam
>          Issue Type: Improvement
>            Reporter: bakeypan
>
> Now the GroupByKey transforms can only apply on PCollection<KV<K,V>>.So I
have to transform PCollection<T> to PCollection<KV<K,V>> before I want to
apply GroupByKey.
> I think we can do better by apply GroupByKey on normal type of PCollection other than
KV.And user can offer one custome extract key function or we can offer default extract key
function.Just like this:
> PCollection<T> input = ...
> PCollection<KV<K,Iterable<V>>> result = input.apply(GroupByKey.<K,
V>create(new ExtractFn()));



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