[ https://issues.apache.org/jira/browse/HIVE-25370?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Zoltan Haindrich reassigned HIVE-25370: --------------------------------------- > 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 > > 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} -- This message was sent by Atlassian Jira (v8.3.4#803005)