[jira] [Commented] (TAJO-1991) Tablespace::getVolume should take filter predication

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TAJO-1991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15086344#comment-15086344 ] 

ASF GitHub Bot commented on TAJO-1991:
--------------------------------------

Github user hyunsik commented on the pull request:

    https://github.com/apache/tajo/pull/901#issuecomment-169472813
  
    Rebased. Thanks!


> Tablespace::getVolume should take filter predication
> ----------------------------------------------------
>
>                 Key: TAJO-1991
>                 URL: https://issues.apache.org/jira/browse/TAJO-1991
>             Project: Tajo
>          Issue Type: Improvement
>          Components: Storage
>            Reporter: Hyunsik Choi
>            Assignee: Hyunsik Choi
>             Fix For: 0.12.0, 0.11.1
>
>
> {{Tablespace::getVolume}} plays a role to guess or compute exactly the table volume. This volume result is usually used for join optimization. But, currently {{Tablespace::getVolume}} just returns whole table volume. It may cause sub optimal join order, especially in partitioned tables or indexable tables like HBase.
> The main objective of this patch is to improve {{getVolume}} method to take filter predicates and return more reasonable volume sizes according to predicates.



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