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From "Hyunsik Choi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TAJO-266) Extend ExecutionBlock and Task to support multiple outputs
Date Fri, 22 Nov 2013 04:23:40 GMT

    [ https://issues.apache.org/jira/browse/TAJO-266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13829638#comment-13829638
] 

Hyunsik Choi commented on TAJO-266:
-----------------------------------

The purpose is very great and definitely necessary for us. But, I'm not sure that this concept
would be work well. To ensure that, we need a prototype. So, I would like to suggest you to
make a branch and test some example queries. For example, the current Tajo does not support
self-join. If multiple output is supported, self joins will be easily implemented without
duplicate scans. If you agree, I would like to participated in that work.

> Extend ExecutionBlock and Task to support multiple outputs
> ----------------------------------------------------------
>
>                 Key: TAJO-266
>                 URL: https://issues.apache.org/jira/browse/TAJO-266
>             Project: Tajo
>          Issue Type: Task
>          Components: distributed query plan, worker
>            Reporter: Jihoon Son
>            Assignee: Jihoon Son
>         Attachments: convert execution plan.jpg, current master plan.jpg, optimized master
plan.jpg
>
>
> In the current Tajo, every task has the only one output.
> However, supporting multiple outputs per task very useful for the distributed plan optimization.



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