[jira] [Resolved] (CRUNCH-57) Add a length function to PCollection

["Josh Wills (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CRUNCH-57?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Josh Wills resolved CRUNCH-57.
------------------------------

       Resolution: Fixed
    Fix Version/s: 0.4.0

Committed Kiyan's new length() impl that makes use of PObject, and I'm expecting that we'll pick up the min/max/sort thread on another JIRA or on crunch-dev.
                
> 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
>             Fix For: 0.4.0
>
>         Attachments: CRUNCH-57.patch, CRUNCH-57.patch, MinMaxFn.patch, minver2.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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