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https://issues.apache.org/jira/browse/HIVE-530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12725148#action_12725148
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Yongqiang He commented on HIVE-530:
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This patch intends to avoid one unneeded job which serves as intermediate data
store. am i right?
The failure Zheng commented is caused by passing null as conf in the failed
testcase.
> Map Join followup: optimize number of map-reduce jobs
> -----------------------------------------------------
>
> Key: HIVE-530
> URL: https://issues.apache.org/jira/browse/HIVE-530
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.4.0
> Reporter: Namit Jain
> Assignee: Namit Jain
> Attachments: hive.530.1.patch, hive.530.2.patch, hive.530.3.patch
>
>
> Instead of creating a temporary destination after every mapJoin, avoid
> where-ever possible.
> Also, replace the Select after MapJoin with a ForwardOperator
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