maropu opened a new pull request #23566: [SPARK-26637][SQL] Makes GetArrayItem nullability more precise URL: https://github.com/apache/spark/pull/23566 ## What changes were proposed in this pull request? In the master, GetArrayItem nullable is always true; https://github.com/apache/spark/blob/cf133e611020ed178f90358464a1b88cdd9b7889/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeExtractors.scala#L236 But, If input array size is constant and ordinal is foldable, we could make GetArrayItem nullability more precise. This pr added code to make `GetArrayItem` nullability more precise. ## How was this patch tested? Added tests in `ComplexTypeSuite`.
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