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https://issues.apache.org/jira/browse/DATAFU-117?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eyal Allweil updated DATAFU-117:
--------------------------------
    Attachment: DATAFU-117-2.patch

This replaces the previous patch file, addresses (most of) Matthew's comments, 
and adds an Algebraic implementation to the UDF.

> New UDF - CountDistinctUpTo
> ---------------------------
>
>                 Key: DATAFU-117
>                 URL: https://issues.apache.org/jira/browse/DATAFU-117
>             Project: DataFu
>          Issue Type: New Feature
>            Reporter: Eyal Allweil
>         Attachments: DATAFU-117-2.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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