Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17185#discussion_r163322810
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala
---
@@ -88,12 +88,12 @@ case class UnresolvedAttribute(nameParts: Seq[String])
extends Attribute with Un
override def exprId: ExprId = throw new UnresolvedException(this,
"exprId")
override def dataType: DataType = throw new UnresolvedException(this,
"dataType")
override def nullable: Boolean = throw new UnresolvedException(this,
"nullable")
- override def qualifier: Option[String] = throw new
UnresolvedException(this, "qualifier")
+ override def qualifier: Option[Seq[String]] = throw new
UnresolvedException(this, "qualifier")
--- End diff --
I think we can just use `Seq[String]`
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