Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/9556#discussion_r44371174
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala
---
@@ -141,6 +141,10 @@ case class UnresolvedFunction(
override def nullable: Boolean = throw new UnresolvedException(this,
"nullable")
override lazy val resolved = false
+ override def prettyString: String = {
+ s"${name}(${children.map(_.prettyString).mkString(",")})"
--- End diff --
@rxin @marmbrus It is better to change the `prettyString` of
`UnresolvedFunction` to get rid of that `'` (e.g. `'abs`). The impact of this
change is that if any user rely on that `'`, his/her code will break.
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