Tanel Kiis created SPARK-33177:
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Summary: CollectList and CollectSet should not be nullable
Key: SPARK-33177
URL: https://issues.apache.org/jira/browse/SPARK-33177
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.1.0
Reporter: Tanel Kiis
CollectList and CollectSet SQL expressions never return null value. Marking
them as non-nullable can have some performance benefits, because some optimizer
rules apply only to non-nullable expressions
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