Github user kiszk commented on a diff in the pull request: https://github.com/apache/spark/pull/13704#discussion_r70199583 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala --- @@ -2018,6 +2018,8 @@ class Analyzer( fail(child, DateType, walkedTypePath) case (StringType, to: NumericType) => fail(child, to, walkedTypePath) + case (from: ArrayType, to: ArrayType) if !from.containsNull => --- End diff -- I will try improving the `SimplifyCasts` rule to force to eliminate the cast from non-element-nullable array to nullable ones. I do not understand the following. Will it be automatically done by improving the `SimplifyCasts` or do we need to improve another rule? > "we can handle map too" I will add unit tests for it. I think that it is good to add a benchmark to show degree of improvements.
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