Takuya Ueshin created SPARK-3969:
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Summary: Optimizer should have a super class as an interface.
Key: SPARK-3969
URL: https://issues.apache.org/jira/browse/SPARK-3969
Project: Spark
Issue Type: Improvement
Components: SQL
Reporter: Takuya Ueshin
Some developers want to replace {{Optimizer}} to fit their projects but can't
do so because currently {{Optimizer}} is an {{object}}.
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