[
https://issues.apache.org/jira/browse/HIVE-3421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14106624#comment-14106624
]
wangmeng commented on HIVE-3421:
--------------------------------
this is very useful!!! I am waiting the coming version
> Column Level Top K Values Statistics
> ------------------------------------
>
> Key: HIVE-3421
> URL: https://issues.apache.org/jira/browse/HIVE-3421
> 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.5.txt,
> HIVE-3421.patch.6.txt, HIVE-3421.patch.7.txt, HIVE-3421.patch.8.txt,
> HIVE-3421.patch.9.txt, HIVE-3421.patch.txt
>
>
> Compute (estimate) top k values statistics 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)
> https://cwiki.apache.org/Hive/listbucketing.html.
> 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:
> http://www.cs.ucsb.edu/research/tech_reports/reports/2005-23.pdf
--
This message was sent by Atlassian JIRA
(v6.2#6252)
