[BUG]The Scala UDF function cannot invoke the UDF compiler when it's passed to "explode"

[wjxiz1992]

Describe the bug
When a UDF is passed to explode() function like explode(myUdf), the UDF compiler will not be used to try to compile this myUdf.

Root cause
The udf plugin didn't try to replace a udf is this udf is a child plan of Project

Steps/Code to reproduce bug

    val myudf: (String) => Array[String] = a => {
      a.split(",")
    }
    val u = makeUdf(myudf)
    val dataset = List("first,second").toDF("x").repartition(1)
    var result = dataset.withColumn("new", explode(u(col("x"))))
    result.explain(true)

Expected behavior
I should be able to see the compiled Catalyst expressions like "split(x....) AS new" after "Analyzed Logical Plan".

Environment details (please complete the following information)

• Environment location: Local in an IDEA debug environment
• Spark configuration settings related to the issue :

    .set("spark.sql.extensions", "com.nvidia.spark.udf.Plugin")
    .set("spark.rapids.sql.udfCompiler.enabled", "true")
    .set("spark.rapids.sql.test.enabled", "true")

[wjxiz1992]

With the fix from @abellina , the project child of explode can be compiled now.

diff --git a/udf-compiler/src/main/scala/com/nvidia/spark/udf/Plugin.scala b/udf-compiler/src/main/scala/com/nvidia/spark/udf/Plugin.scala
index 679d126b9..98164e70e 100644
--- a/udf-compiler/src/main/scala/com/nvidia/spark/udf/Plugin.scala
+++ b/udf-compiler/src/main/scala/com/nvidia/spark/udf/Plugin.scala
@@ -82,7 +82,7 @@ case class LogicalPlanRules() extends Rule[LogicalPlan] with Logging {
       plan match {
         case project: Project =>
           Project(project.projectList.map(e => attemptToReplaceExpression(plan, e))
-              .asInstanceOf[Seq[NamedExpression]], project.child)
+              .asInstanceOf[Seq[NamedExpression]], apply(project.child))
         case x => {
           x.transformExpressions(replacePartialFunc(plan))
         }

The real problem and correct description for this issue turns to be "child of Project cannot be replaced".
@abellina Do you think we can close this issue with your fix and create another issue for GpuExplode ? It's for the sql plugin side, not a UDF problem.