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From "Matthew Hayes (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (DATAFU-117) New UDF - CountDistinctUpTo
Date Tue, 28 Jun 2016 15:58:57 GMT

     [ https://issues.apache.org/jira/browse/DATAFU-117?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matthew Hayes closed DATAFU-117.
--------------------------------
    Resolution: Fixed

> New UDF - CountDistinctUpTo
> ---------------------------
>
>                 Key: DATAFU-117
>                 URL: https://issues.apache.org/jira/browse/DATAFU-117
>             Project: DataFu
>          Issue Type: New Feature
>            Reporter: Eyal Allweil
>            Assignee: Eyal Allweil
>             Fix For: 1.3.1
>
>         Attachments: DATAFU-117-2.patch, DATAFU-117-3.patch, DATAFU-117-4.patch, DATAFU-117.patch
>
>
> A UDF that counts distinct tuples within a bag, but only up to a preset limit. If the
bag contains more distinct tuples than the limit, the UDF returns the limit. 
> This UDF can run reasonably well even on large bags if the limit chosen is small enough
though the count is done in memory.
> We use this UDF in PayPal for filtering, when we don't need to use the actual tuples
afterward.



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