Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10494#discussion_r48802688
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala
---
@@ -397,6 +393,7 @@ abstract class TreeNode[BaseType <: TreeNode[BaseType]]
extends Product {
def argString: String = productIterator.flatMap {
case tn: TreeNode[_] if containsChild(tn) => Nil
case tn: TreeNode[_] => s"${tn.simpleString}" :: Nil
+ case seq: Seq[_] if seq == Seq.empty => "[Empty]" :: Nil
--- End diff --
I think it's used to fix this line:
`case seq: Seq[BaseType] if seq.toSet.subsetOf(children.toSet) => Nil`
We can't reflect on the parameter type, so empty Seq will go into this
branch and return nothing.
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