L. C. Hsieh created SPARK-34474:
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Summary: Remove unnecessary Union under Distinct like operators
Key: SPARK-34474
URL: https://issues.apache.org/jira/browse/SPARK-34474
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.2.0
Reporter: L. C. Hsieh
Assignee: L. C. Hsieh
For an Union under Distinct like operators, if its children are all the same,
we can just keep one among them and remove the Union.
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