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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