Tanel Kiis created SPARK-34922:
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Summary: Use better CBO cost function
Key: SPARK-34922
URL: https://issues.apache.org/jira/browse/SPARK-34922
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.2.0
Reporter: Tanel Kiis
In SPARK-33935 we changed the CBO cost function such that it would be symetric
- A.betterThan(B) implies that !B.betterThan(A). Before both could have been
true.
That change introduced a performance regression in some queries.
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