Ryan Johnson created SPARK-44071:
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             Summary: Define UnresolvedNode trait to reduce redundancy
                 Key: SPARK-44071
                 URL: https://issues.apache.org/jira/browse/SPARK-44071
             Project: Spark
          Issue Type: New Feature
          Components: Spark Core
    Affects Versions: 3.5.0
            Reporter: Ryan Johnson


Looking at 
[unresolved.scala|https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala],
 spark would benefit from an {{UnresolvedNode}} trait that various 
{{UnresolvedFoo}} classes could inherit from:
{code:java}
trait UnresolvedNode extends LogicalPlan {
  override def output: Seq[Attribute] = Nil
  override lazy val resolved = false
}{code}
Today, the code is duplicated in ~20 locations.



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