Fix compilation

Author: hvanhovell

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/package.scala

@@ -163,7 +163,7 @@ package object expressions  {
       // Collect matching attributes given a name and a lookup.
       def collectMatches(name: String, candidates: Option[Seq[Attribute]]): Seq[Attribute] = {
         candidates.toSeq.flatMap(_.collect {
-          case a if !a.isGenerated && resolver(a.name, name) => a.withName(name)
+          case a if resolver(a.name, name) => a.withName(name)
         })
       }