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From "Prasanth Jayachandran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12309) TableScan should use column stats when available for better data size estimate
Date Tue, 10 Nov 2015 22:23:11 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14999461#comment-14999461
] 

Prasanth Jayachandran commented on HIVE-12309:
----------------------------------------------

+1

> 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
>            Reporter: Ashutosh Chauhan
>            Assignee: Ashutosh Chauhan
>         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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