Shaofeng SHI created KYLIN-1917:
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Summary: TopN counter merge performance improvement
Key: KYLIN-1917
URL: https://issues.apache.org/jira/browse/KYLIN-1917
Project: Kylin
Issue Type: Improvement
Components: Job Engine
Affects Versions: v1.5.2, v1.5.3
Reporter: Shaofeng SHI
Fix For: Backlog
Observed the reduce phase of cube build is slow when there is TopN counter.
There should be room for performance improvement.
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