Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/17251#discussion_r108853416
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -590,6 +591,21 @@ object TypeCoercion {
}
/**
+ * Coerces NullTypes of a Stack function to the corresponding column
types.
--- End diff --
> Coerces NullTypes in the `Stack` expression to the column types of the
corresponding positions.
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