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https://issues.apache.org/jira/browse/CRUNCH-58?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13450329#comment-13450329
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Rahul Sharma commented on CRUNCH-58:
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Why not return a Collection<T> from PObject if there are multiple elements in
the PCollection ? This way we could support use cases like top 5/bottom 5
elements. In such a case the max/min API can return Collection<T>. Also the FJ
paper has concepts of returning back Collection in PObjects.
> Implement PObject in Crunch/Scrunch
> -----------------------------------
>
> Key: CRUNCH-58
> URL: https://issues.apache.org/jira/browse/CRUNCH-58
> Project: Crunch
> Issue Type: New Feature
> Affects Versions: 0.3.0
> Reporter: Kiyan Ahmadizadeh
> Assignee: Kiyan Ahmadizadeh
>
> FlumeJava has the concept of a PObject<T>, a container for a singleton of
> type T. It is meant represent the result of a distributed computation that
> yields a singleton value (for example max, min, and length methods on
> PCollection<T>). Generally speaking, the result of any computation that
> combines/reduces a PCollection into a singleton value could be represented by
> a PObject.
> Like PCollection, a PObject defers distributed computation until its value is
> actually used.
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