Zoltan Haindrich created HIVE-25370:
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Summary: 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
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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