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https://issues.apache.org/jira/browse/HIVE-17011?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rajesh Balamohan updated HIVE-17011:
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Attachment: HIVE-17011.1.patch
Attaching .1 patch.
Tested on a query which had 100s of unionall on simple table.
Without patch, SharedWorkOptimizer::transform took {{323.667 seconds}}
With Patch, SharedWorkOptimizer::transform {{116.395 seconds}}
\cc [~jcamachorodriguez]
> PlanUtils.getExprList() causes memory pressure when invoked from
> SharedWorkOptimizer on queries with lots of union operators
> ----------------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-17011
> URL: https://issues.apache.org/jira/browse/HIVE-17011
> Project: Hive
> Issue Type: Bug
> Reporter: Rajesh Balamohan
> Attachments: CPU_usage.png, HIVE-17011.1.patch, Memory_usage.png
>
>
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