Takeshi Yamamuro created SPARK-26965:
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Summary: Makes ElementAt nullability more precise
Key: SPARK-26965
URL: https://issues.apache.org/jira/browse/SPARK-26965
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.4.0
Reporter: Takeshi Yamamuro
In master, ElementAt nullable is always true;
https://github.com/apache/spark/blob/be1cadf16dc70e22eae144b3dfce9e269ef95acc/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala#L1977
But, If input key is foldable, we could make its nullability more precise.
This fix is the same with SPARK-26747 and -SPARK-26637-
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