Subject: [jira] [Created] (HIVE-17308) Improvement in join
cardinality estimation



Vineet Garg created HIVE-17308:
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Summary: Improvement in join cardinality estimation
Key: HIVE-17308
URL: https://issues.apache.org/jira/browse/HIVE-17308
Project: Hive
Issue Type: Improvement
Components: Query Planning
Reporter: Vineet Garg
Assignee: Vineet Garg


Currently during logical planning join cardinality is estimated assuming no
correlation among join keys (This estimation is done using exponential
backoff). Physical planning on the other hand consider correlation for multi
keys and uses different estimation. We should consider correlation during
logical planning as well.



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