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Posted to issues@tajo.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2015/06/24 13:14:04 UTC

[jira] [Commented] (TAJO-1659) Simplify scan iteration in SeqScan

    [ https://issues.apache.org/jira/browse/TAJO-1659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14599254#comment-14599254 ] 

ASF GitHub Bot commented on TAJO-1659:
--------------------------------------

GitHub user hyunsik opened a pull request:

    https://github.com/apache/tajo/pull/612

    TAJO-1659: Simplify scan iteration in SeqScan.

    

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/hyunsik/tajo TAJO-1659

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/tajo/pull/612.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #612
    
----
commit 90e20d617a9c6af176035f6039d6bbdd8e4f3331
Author: Hyunsik Choi <hy...@apache.org>
Date:   2015-06-24T11:12:37Z

    TAJO-1659: Simplify scan iteration in SeqScan.

----


> Simplify scan iteration in SeqScan
> ----------------------------------
>
>                 Key: TAJO-1659
>                 URL: https://issues.apache.org/jira/browse/TAJO-1659
>             Project: Tajo
>          Issue Type: Improvement
>          Components: physical operator
>            Reporter: Hyunsik Choi
>            Assignee: Hyunsik Choi
>             Fix For: 0.11.0
>
>
> SeqScanExec internally uses if-condition branch to perform filter iteration or full-scan iteration on a table. It is possible to cause branch misprediction. Also, this approach makes code messy. This patch introduce an scan iterator to simplify the if-condition branch.



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