Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21704#discussion_r201902635
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala
---
@@ -48,7 +48,8 @@ case class CreateArray(children: Seq[Expression]) extends
Expression {
override def dataType: ArrayType = {
--- End diff --
why `CreateArray` doesn't extend `ComplexTypeMergingExpression`?
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