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From "Feng Lu (JIRA)" <>
Subject [jira] [Updated] (HIVE-3421) Column Level Top K Values Statistics
Date Thu, 06 Sep 2012 17:33:08 GMT


Feng Lu updated HIVE-3421:

    Attachment: HIVE-3421.patch.4.txt
> Column Level Top K Values Statistics
> ------------------------------------
>                 Key: HIVE-3421
>                 URL:
>             Project: Hive
>          Issue Type: New Feature
>            Reporter: Feng Lu
>            Assignee: Feng Lu
>         Attachments: HIVE-3421.patch.1.txt, HIVE-3421.patch.2.txt, HIVE-3421.patch.3.txt,
HIVE-3421.patch.4.txt, HIVE-3421.patch.txt
> Compute (estimate) top k values for each column, and put the most skewed column into
skewed info, if user hasn't specified skew.
> This feature depends on ListBucketing (create table skewed on)
> All column topk can be added to skewed info, if in the future skewed info supports multiple
independent columns.
> The TopK algorithm is based on this paper:

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