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https://issues.apache.org/jira/browse/CRUNCH-57?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13449454#comment-13449454
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Matthias Friedrich commented on CRUNCH-57:
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-0 from me. Do we really want to add even more methods to PCollection?
Shouldn't our core abstractions be minimal? An interface with more than 20
methods looks to me like it's about to lose focus. I think it would suffice
having length() in Aggregation.
> Add a length function to PCollection
> ------------------------------------
>
> Key: CRUNCH-57
> URL: https://issues.apache.org/jira/browse/CRUNCH-57
> Project: Crunch
> Issue Type: New Feature
> Components: Core
> Affects Versions: 0.3.0
> Reporter: Kiyan Ahmadizadeh
> Assignee: Josh Wills
> Attachments: CRUNCH-57.patch
>
>
> Sometimes it's useful and interesting to compute the number of elements in a
> PCollection.
>
> For example, suppose there was an initial PCollection that was then filtered
> into another. If I'm interested in how many elements of the original
> PCollection matched the filter, I'll have to write extra code to compute this.
> PCollections should have a length method that, when called, computes the
> number of elements in the PCollection and returns the result.
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