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From "Hyunsik Choi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TAJO-99) Design the interface of join enumeration algorithm
Date Fri, 11 Oct 2013 07:26:41 GMT

    [ https://issues.apache.org/jira/browse/TAJO-99?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13792428#comment-13792428

Hyunsik Choi commented on TAJO-99:

This patch also fixes a selection push down bug that we haven't found.

> Design the interface of join enumeration algorithm
> --------------------------------------------------
>                 Key: TAJO-99
>                 URL: https://issues.apache.org/jira/browse/TAJO-99
>             Project: Tajo
>          Issue Type: Sub-task
>          Components: planner/optimizer
>            Reporter: Hyunsik Choi
>            Assignee: Hyunsik Choi
>         Attachments: TAJO-99.patch
> The core feature of cost-based optimizer is cost-based join enumeration approach. The
main objective of this is to find the best join order from lots of enumerated join trees.
In database community, there have been many studies for join enumeration ways. 
> It would like to great to provide a generic and pluggable interface for join enumeration
algorithms. It may encourage contributors to implement various join enumeration ways, and
users could choose the best join ordering algorithm for their purpose.

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