Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20687#discussion_r172985682
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/complexTypesSuite.scala
---
@@ -331,4 +330,30 @@ class ComplexTypesSuite extends PlanTest with
ExpressionEvalHelper {
.analyze
comparePlans(Optimizer execute rel, expected)
}
+
+ test("SPARK-23500: Simplify complex ops that aren't at the plan root") {
+ // If nullable attributes aren't used, the array and map test cases
fail because array
+ // and map indexing can return null so the output is marked nullable.
--- End diff --
why? I think the optimization is still valid, we should show this in the
test, instead of hiding it with a nullable attribute.
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