cloud-fan commented on code in PR #40397:
URL: https://github.com/apache/spark/pull/40397#discussion_r1139898978


##########
sql/hive/src/main/scala/org/apache/spark/sql/hive/hiveUDFs.scala:
##########
@@ -49,68 +48,137 @@ private[hive] case class HiveSimpleUDF(
     name: String, funcWrapper: HiveFunctionWrapper, children: Seq[Expression])
   extends Expression
   with HiveInspectors
-  with CodegenFallback
-  with Logging
   with UserDefinedExpression {
 
+  @transient
+  private lazy val evaluator = new HiveSimpleUDFEvaluator(funcWrapper, 
children)
+
   override lazy val deterministic: Boolean = isUDFDeterministic && 
children.forall(_.deterministic)
 
   override def nullable: Boolean = true
 
   @transient
-  lazy val function = funcWrapper.createFunction[UDF]()
+  private val isUDFDeterministic = {
+    val udfType = 
evaluator.function.getClass.getAnnotation(classOf[HiveUDFType])
+    udfType != null && udfType.deterministic() && !udfType.stateful()
+  }
+
+  override def foldable: Boolean = isUDFDeterministic && 
children.forall(_.foldable)
+
+  override lazy val dataType: DataType = 
javaTypeToDataType(evaluator.method.getGenericReturnType)
+
+  // TODO: Finish input output types.
+  override def eval(input: InternalRow): Any = {
+    children.zipWithIndex.map {
+      case (child, idx) =>
+        evaluator.setArg(idx, child.eval(input))
+    }
+    evaluator.evaluate()
+  }
+
+  override def toString: String = {
+    s"$nodeName#${funcWrapper.functionClassName}(${children.mkString(",")})"
+  }
+
+  override def prettyName: String = name
+
+  override def sql: String = s"$name(${children.map(_.sql).mkString(", ")})"
+
+  override protected def withNewChildrenInternal(newChildren: 
IndexedSeq[Expression]): Expression =
+    copy(children = newChildren)
+
+  protected def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
+    val refEvaluator = ctx.addReferenceObj("evaluator", evaluator)
+    val evals = children.map(_.genCode(ctx))
+
+    val setValues = evals.zipWithIndex.map {
+      case (eval, i) =>
+        s"""
+           |if (${eval.isNull}) {
+           |  $refEvaluator.setArg($i, null);
+           |} else {
+           |  $refEvaluator.setArg($i, ${eval.value});
+           |}
+           |""".stripMargin
+    }
+
+    val resultType = CodeGenerator.boxedType(dataType)
+    val resultTerm = ctx.freshName("result")
+    ev.copy(code =
+      code"""
+         |${evals.map(_.code).mkString("\n")}
+         |${setValues.mkString("\n")}
+         |$resultType $resultTerm = null;
+         |boolean ${ev.isNull} = false;
+         |try {
+         |  $resultTerm = ($resultType) $refEvaluator.evaluate();
+         |  ${ev.isNull} = $resultTerm == null;
+         |} catch (Throwable e) {
+         |  throw QueryExecutionErrors.failedExecuteUserDefinedFunctionError(

Review Comment:
   shall we move the try-catch to `evaluator.evaluate()`?



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