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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-7654) A method to extrapolate columnStats for partitions of a table
Date Sat, 23 Aug 2014 00:56:11 GMT

     [ https://issues.apache.org/jira/browse/HIVE-7654?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ashutosh Chauhan updated HIVE-7654:
-----------------------------------

       Resolution: Fixed
    Fix Version/s: 0.14.0
           Status: Resolved  (was: Patch Available)

Committed to trunk. Thanks, Pengcheng!

> 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
>          Components: Statistics
>            Reporter: pengcheng xiong
>            Assignee: pengcheng xiong
>            Priority: Minor
>             Fix For: 0.14.0
>
>         Attachments: Extrapolate the Column Status.docx, HIVE-7654.0.patch, HIVE-7654.1.patch,
HIVE-7654.4.patch, HIVE-7654.6.patch, HIVE-7654.7.patch, HIVE-7654.8.patch, HIVE-7654.9.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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