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https://issues.apache.org/jira/browse/DATAFU-117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15233995#comment-15233995
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Eyal Allweil commented on DATAFU-117:
-------------------------------------
Thanks for the feedback! I will incorporate it in a future patch, but I'm
trying to check whether I can revise this UDF to have an Algebraic
implementation (which should further improve its performance). I'll open a
review board on this version as soon as I can.
> 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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