Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21103#discussion_r205928882
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -3651,14 +3651,9 @@ case class ArrayDistinct(child: Expression)
}
/**
- * Will become common base class for [[ArrayUnion]], ArrayIntersect, and
ArrayExcept.
+ * Will become common base class for [[ArrayUnion]], ArrayIntersect, and
[[ArrayExcept]].
*/
abstract class ArraySetLike extends BinaryArrayExpressionWithImplicitCast {
--- End diff --
I think the question is, shall we apply type coercion rules to these array
functions?
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