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https://issues.apache.org/jira/browse/CRUNCH-376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13969308#comment-13969308
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Gabriel Reid commented on CRUNCH-376:
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{quote}one concern: the result of an Aggregator call isn't necessarily a single
value{quote}
About this, how about making the return type of PCollection#aggregate a
PCollection, and then adding a method like getFirst (or something like that) to
PCollection. It's slightly less convenient for the case where aggregate()
returns a single value, but that way it'll work for everything.
> Add aggregate(...) function to PCollection
> ------------------------------------------
>
> Key: CRUNCH-376
> URL: https://issues.apache.org/jira/browse/CRUNCH-376
> Project: Crunch
> Issue Type: New Feature
> Components: Core
> Reporter: Jason Gauci
> Assignee: Josh Wills
> Priority: Minor
> Attachments: CRUNCH-376b.patch
>
>
> This patch adds an aggregate() function to PCollection so you can do things
> like sum a collection of integers in one line.
> https://github.com/MisterTea/crunch/commit/4bd8b7a13b893ddb89c11d657ba5347b92fe5a88
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