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From "Kiyan Ahmadizadeh (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CRUNCH-57) Add a length function to PCollection
Date Wed, 05 Sep 2012 21:01:11 GMT
Kiyan Ahmadizadeh created CRUNCH-57:
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             Summary: 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


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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