[GitHub] rednaxelafx commented on a change in pull request #23320: [SPARK-26370][SQL] Fix resolution of higher-order function for the same identifier.

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rednaxelafx commented on a change in pull request #23320: [SPARK-26370][SQL] Fix resolution of higher-order function for the same identifier.
URL: https://github.com/apache/spark/pull/23320#discussion_r241678096
 
 

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 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/higherOrderFunctions.scala
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 @@ -22,12 +22,30 @@ import java.util.concurrent.atomic.AtomicReference
 import scala.collection.mutable
 
 import org.apache.spark.sql.catalyst.InternalRow
-import org.apache.spark.sql.catalyst.analysis.{TypeCheckResult, TypeCoercion, UnresolvedAttribute}
+import org.apache.spark.sql.catalyst.analysis.{TypeCheckResult, TypeCoercion, UnresolvedAttribute, UnresolvedException}
 import org.apache.spark.sql.catalyst.expressions.codegen._
 import org.apache.spark.sql.catalyst.util._
 import org.apache.spark.sql.types._
 import org.apache.spark.unsafe.array.ByteArrayMethods
 
+/**
+ * A placeholder of lambda variables to prevent unexpected resolution of [[LambdaFunction]].
+ */
+case class UnresolvedNamedLambdaVariable(nameParts: Seq[String])
+  extends LeafExpression with NamedExpression with Unevaluable {
+
 
 Review comment:
   Can we provide something like `toString` to give better `explain` output? It looks like this node prints as just `unresolvednamedlambdavariable()` without the `nameParts` right now

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