datafu-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Matthew Hayes (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DATAFU-117) New UDF - CountDistinctUpTo
Date Tue, 17 May 2016 19:20:12 GMT

    [ https://issues.apache.org/jira/browse/DATAFU-117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15287340#comment-15287340
] 

Matthew Hayes commented on DATAFU-117:
--------------------------------------

Hey sorry will get to this today.

> 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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message