Github user HeartSaVioR commented on a diff in the pull request:
https://github.com/apache/spark/pull/23169#discussion_r237307829
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/trees/TreeNodeSuite.scala
---
@@ -595,4 +596,14 @@ class TreeNodeSuite extends SparkFunSuite {
val expected = Coalesce(Stream(Literal(1), Literal(3)))
assert(result === expected)
}
+
+ test("toString() tree depth") {
--- End diff --
`treeString` sounds right to me rather than `toString`.
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