maropu opened a new pull request #23669: [SPARK-26747][SQL] Makes GetMapValue nullability more precise URL: https://github.com/apache/spark/pull/23669 ## What changes were proposed in this pull request? IIn master, `GetMapValue` nullable is always true; https://github.com/apache/spark/blob/cf133e611020ed178f90358464a1b88cdd9b7889/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeExtractors.scala#L371 But, If input key is foldable, we could make its nullability more precise. This fix is the same with SPARK-26637(#23566). ## How was this patch tested? Added tests in `ComplexTypeSuite`.
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