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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4258) Log logical plan tree for debugging
Date Fri, 29 Mar 2013 11:37:15 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13617261#comment-13617261
] 

Namit Jain commented on HIVE-4258:
----------------------------------

I agree, I end up doing some similar hack all the time

+1
                
> Log logical plan tree for debugging
> -----------------------------------
>
>                 Key: HIVE-4258
>                 URL: https://issues.apache.org/jira/browse/HIVE-4258
>             Project: Hive
>          Issue Type: Improvement
>          Components: Diagnosability
>            Reporter: Navis
>            Assignee: Navis
>            Priority: Trivial
>         Attachments: HIVE-4258.D9801.1.patch
>
>
> Debugging or implementing optimizer, knowing the shape of logical plan helps general
progress of it.
> For example,
> select count(val) from (select a.key as key, b.value as array_val from src a join array_valued_src
b on a.key=b.key) i lateral view explode (array_val) c as val
> {noformat} 
> TS[1]-RS[2]-JOIN[4]-SEL[5]-LVF[6]-SEL[7]-LVJ[10]-SEL[11]-GBY[12]-RS[13]-GBY[14]-SEL[15]-FS[16]
>                                  -SEL[8]-UDTF[9]-LVJ[10]
> TS[0]-RS[3]-JOIN[4]
> {noformat} 

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