Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/20687#discussion_r173006092 --- Diff: sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/complexTypesSuite.scala --- @@ -331,4 +330,31 @@ 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") { + val structRel = relation + .select(GetStructField(CreateNamedStruct(Seq("att1", 'nullable_id)), 0, None) as "foo") + .groupBy($"foo")("1").analyze + val structExpected = relation + .select('nullable_id as "foo") + .groupBy($"foo")("1").analyze + comparePlans(Optimizer execute structRel, structExpected) + + // If nullable attributes aren't used in the 'expected' plans, the array and map test + // cases fail because array and map indexing can return null so the output attribute --- End diff -- This explains why the original plan(before optimize) marks its output as nullable, but I'm confused why the optimized plan still marks its output as nullable.
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