Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/2155#discussion_r16857315
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/package.scala
---
@@ -37,4 +37,15 @@ package object trees extends Logging {
// Since we want tree nodes to be lightweight, we create one logger for
all treenode instances.
protected override def logName = "catalyst.trees"
+ /**
+ * A [[TreeNode]] companion for reference equality for Hash based
Collection.
+ */
+ implicit class TreeNodeRef(val obj: TreeNode[_]) {
--- End diff --
Why is this an implicit class?
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