Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/17251#discussion_r119132961
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -649,6 +650,21 @@ object TypeCoercion {
}
/**
+ * Coerces NullTypes in the Stack expression to the column types of the
corresponding positions.
+ */
+ object StackCoercion extends Rule[LogicalPlan] {
+ def apply(plan: LogicalPlan): LogicalPlan = plan resolveExpressions {
+ case s @ Stack(children) if s.childrenResolved &&
s.hasFoldableRowNums =>
+ Stack(children.zipWithIndex.map {
--- End diff --
This need to reconstruct `Stack`. We cannot use `children.tail` here.
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