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Posted to dev@datafu.apache.org by "Eyal Allweil (JIRA)" <ji...@apache.org> on 2016/03/24 16:41:25 UTC

[jira] [Updated] (DATAFU-117) New UDF - CountDistinctUpTo

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

Eyal Allweil updated DATAFU-117:
--------------------------------
    Attachment: DATAFU-117.patch

Patch including new UDF and test (in BagTests)

> 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.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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