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Posted to dev@tajo.apache.org by "Jihoon Son (JIRA)" <ji...@apache.org> on 2013/12/03 05:24:36 UTC

[jira] [Commented] (TAJO-316) Improve GreedyHeuristicJoinOrderAlgorithm to deal with non-commutative joins

    [ https://issues.apache.org/jira/browse/TAJO-316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13837314#comment-13837314 ] 

Jihoon Son commented on TAJO-316:
---------------------------------

Great work!
When you post the next patch, I'll review it.

> Improve GreedyHeuristicJoinOrderAlgorithm to deal with non-commutative joins
> ----------------------------------------------------------------------------
>
>                 Key: TAJO-316
>                 URL: https://issues.apache.org/jira/browse/TAJO-316
>             Project: Tajo
>          Issue Type: Improvement
>          Components: planner/optimizer
>            Reporter: Hyunsik Choi
>            Assignee: Hyunsik Choi
>              Labels: cbo
>             Fix For: 0.8-incubating
>
>         Attachments: TAJO-316.patch
>
>
> GreedyHeuristicJoinOrderAlgorithm is a default cost-based join order algorithm. It is designed only for inner joins, and it cannot deal with non-commutative joins, such as left/right/full outer join and semi/anti join. The main goal of this issue is to improve this algorithm to deal with them.



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