[GitHub] maropu opened a new pull request #23867: [SPARK-26965][SQL] Makes ElementAt nullability more precise

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maropu opened a new pull request #23867: [SPARK-26965][SQL] Makes ElementAt nullability more precise
URL: https://github.com/apache/spark/pull/23867
 
 
   ## What changes were proposed in this pull request?
   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-26637(#23566) and SPARK-26747(#23669)
   
   ## How was this patch tested?
   Added tests in `CollectionExpressionsSuite`.

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