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https://issues.apache.org/jira/browse/HIVE-17486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16309171#comment-16309171
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Hive QA commented on HIVE-17486:
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| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 11s{color}
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/data/hiveptest/logs/PreCommit-HIVE-Build-8411/patches/PreCommit-HIVE-Build-8411.patch
does not apply to master. Rebase required? Wrong Branch? See
http://cwiki.apache.org/confluence/display/Hive/HowToContribute for help.
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http://104.198.109.242/logs//PreCommit-HIVE-Build-8411/yetus.txt |
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This message was automatically generated.
> Enable SharedWorkOptimizer in tez on HOS
> ----------------------------------------
>
> Key: HIVE-17486
> URL: https://issues.apache.org/jira/browse/HIVE-17486
> Project: Hive
> Issue Type: Bug
> Reporter: liyunzhang
> Assignee: liyunzhang
> Attachments: HIVE-17486.1.patch, HIVE-17486.2.patch,
> HIVE-17486.3.patch, HIVE-17486.4.patch, HIVE-17486.5.patch,
> explain.28.share.false, explain.28.share.true, scanshare.after.svg,
> scanshare.before.svg
>
>
> in HIVE-16602, Implement shared scans with Tez.
> Given a query plan, the goal is to identify scans on input tables that can be
> merged so the data is read only once. Optimization will be carried out at the
> physical level. In Hive on Spark, it caches the result of spark work if the
> spark work is used by more than 1 child spark work. After sharedWorkOptimizer
> is enabled in physical plan in HoS, the identical table scans are merged to 1
> table scan. This result of table scan will be used by more 1 child spark
> work. Thus we need not do the same computation because of cache mechanism.
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