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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-12309) TableScan should use column stats when available for better data size estimate
Date Tue, 10 Nov 2015 22:59:11 GMT

     [ https://issues.apache.org/jira/browse/HIVE-12309?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ashutosh Chauhan updated HIVE-12309:
------------------------------------
    Affects Version/s: 0.14.0
                       1.0.0
                       1.2.0
                       1.1.0

> TableScan should use column stats when available for better data size estimate
> ------------------------------------------------------------------------------
>
>                 Key: HIVE-12309
>                 URL: https://issues.apache.org/jira/browse/HIVE-12309
>             Project: Hive
>          Issue Type: Improvement
>          Components: Statistics
>    Affects Versions: 0.14.0, 1.0.0, 1.2.0, 1.1.0
>            Reporter: Ashutosh Chauhan
>            Assignee: Ashutosh Chauhan
>             Fix For: 2.0.0
>
>         Attachments: HIVE-12309.2.patch, HIVE-12309.patch
>
>
> Currently, all other operators use column stats to figure out data size, whereas TableScan
relies on rawDataSize. This inconsistency can result in an inconsistency where TS may have
lower Datasize then subsequent operators.



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