[jira] [Commented] (TAJO-122) Add EXPLAIN clause to show a logical plan

["DaeMyung Kang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TAJO-122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13868828#comment-13868828 ] 

DaeMyung Kang commented on TAJO-122:
------------------------------------

now reviewboard doesn't work.
so I can't make review on reviewboard.
when it works, I will upload review.

> Add EXPLAIN clause to show a logical plan
> -----------------------------------------
>
>                 Key: TAJO-122
>                 URL: https://issues.apache.org/jira/browse/TAJO-122
>             Project: Tajo
>          Issue Type: New Feature
>          Components: planner/optimizer
>            Reporter: Hyunsik Choi
>            Assignee: DaeMyung Kang
>             Fix For: 0.8-incubating
>
>         Attachments: TAJO-122.patch
>
>
> (I've changed this issue from implementing an utility class to preint JSON to implementing EXPLAIN clause support.)
> For convenience for debugging and developing new engine (TAJO-104), we need EXPLAIN clause to print plans used in Tajo internal. In this issue, we only focus on showing a logical plan.



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