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From "Matthew Hayes (JIRA)" <>
Subject [jira] [Commented] (DATAFU-117) New UDF - CountDistinctUpTo
Date Tue, 17 May 2016 19:20:12 GMT


Matthew Hayes commented on DATAFU-117:

Hey sorry will get to this today.

> New UDF - CountDistinctUpTo
> ---------------------------
>                 Key: DATAFU-117
>                 URL:
>             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

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