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From "pengcheng xiong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7654) A method to extrapolate columnStats for partitions of a table
Date Tue, 12 Aug 2014 17:13:11 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14094321#comment-14094321
] 

pengcheng xiong commented on HIVE-7654:
---------------------------------------

Done.


Thanks!

Best
Pengcheng Xiong
pxiong@hortonworks.com




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> A method to extrapolate columnStats for partitions of a table
> -------------------------------------------------------------
>
>                 Key: HIVE-7654
>                 URL: https://issues.apache.org/jira/browse/HIVE-7654
>             Project: Hive
>          Issue Type: New Feature
>            Reporter: pengcheng xiong
>            Assignee: pengcheng xiong
>            Priority: Minor
>         Attachments: Extrapolate the Column Status.docx, HIVE-7654.0.patch
>
>
> In a PARTITIONED table, there are many partitions. For example, 
> create table if not exists loc_orc (
>   state string,
>   locid int,
>   zip bigint
> ) partitioned by(year string) stored as orc;
> We assume there are 4 partitions, partition(year='2000'), partition(year='2001'), partition(year='2002')
and partition(year='2003').
> We can use the following command to compute statistics for columns state,locid of partition(year='2001')
> analyze table loc_orc partition(year='2001') compute statistics for columns state,locid;
> We need to know the “aggregated” column status for the whole table loc_orc. However,
we may not have the column status for some partitions, e.g., partition(year='2002') and also
we may not have the column status for some columns, e.g., zip bigint for partition(year='2001')
> We propose a method to extrapolate the missing column status for the partitions.



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