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https://issues.apache.org/jira/browse/HIVE-3670?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yin Huai resolved HIVE-3670.
----------------------------

    Resolution: Not A Problem

Based on the code of setChildren in MapOperator, if multiple TableScanOperators 
are associated to the same path, those TableScanOperators will all be added 
into the children list of MapOperator. We can take advantage of it by adding 
optimizations (in separate jiras) which can make sure those operation paths 
using the same inputs can be executed in the same MR job. I will close this 
jira as "Not A Problem".
                
> Optimize queries involving self join
> ------------------------------------
>
>                 Key: HIVE-3670
>                 URL: https://issues.apache.org/jira/browse/HIVE-3670
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Query Processor
>            Reporter: Yin Huai
>            Assignee: Yin Huai
>


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