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https://issues.apache.org/jira/browse/HIVE-25370?focusedWorklogId=628916&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-628916
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ASF GitHub Bot logged work on HIVE-25370:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 28/Jul/21 08:01
Start Date: 28/Jul/21 08:01
Worklog Time Spent: 10m
Work Description: kgyrtkirk merged pull request #2536:
URL: https://github.com/apache/hive/pull/2536
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Issue Time Tracking
-------------------
Worklog Id: (was: 628916)
Time Spent: 40m (was: 0.5h)
> Improve SharedWorkOptimizer performance
> ---------------------------------------
>
> Key: HIVE-25370
> URL: https://issues.apache.org/jira/browse/HIVE-25370
> Project: Hive
> Issue Type: Improvement
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Labels: pull-request-available
> Time Spent: 40m
> Remaining Estimate: 0h
>
> for queries which are unioning ~800 constant rows the SWO is doing around
> n*n/2 operations trying to find 2 TS-es which could be merged
> {code}
> select constants
> UNION ALL
> ...
> UNION ALL
> select constants
> {code}
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