Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/17251#discussion_r121513942
--- 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
transformAllExpressions {
+ case s @ Stack(children) if s.childrenResolved &&
s.hasFoldableNumRows =>
+ Stack(children.zipWithIndex.map {
+ case (e, 0) => e
+ case (Literal(null, NullType), index: Int) =>
+ Literal.create(null, s.findDataType(index - 1))
--- End diff --
We should pass the original index to `findDataType` and does minus 1
inside.
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