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From "Matthias Friedrich (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CRUNCH-118) Add Aggregator and lib functionality for computing the distinct elements of a PCollection
Date Sat, 24 Nov 2012 10:44:58 GMT

     [ https://issues.apache.org/jira/browse/CRUNCH-118?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matthias Friedrich updated CRUNCH-118:
--------------------------------------

    Attachment: CRUNCH-118v3.patch

Great stuff! I think SAMPLE_UNIQUE_ELEMENTS() isn't really random, so I removed this from
the javadoc and I've made a couple of trivial tweaks.

+1, with or without my changes :)
                
> Add Aggregator and lib functionality for computing the distinct elements of a PCollection
> -----------------------------------------------------------------------------------------
>
>                 Key: CRUNCH-118
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-118
>             Project: Crunch
>          Issue Type: Improvement
>          Components: MapReduce Patterns
>            Reporter: Josh Wills
>         Attachments: CRUNCH-118.patch, CRUNCH-118v2.patch, CRUNCH-118v3.patch
>
>
> In my continuing effort to add functions that I like from Hive/Pig to Crunch, I'm proposing
a) an Aggregator that behaves like Hive's collect_set() UDAF and b) an o.a.c.lib.Distinct
library for computing the distinct elements of a PCollection via a groupByKey operation.

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