fix: keep ArrayInsertUnsupportedArgs fallback and quiet codegen log

Disable UDF codegen dispatch within the ArrayInsertUnsupportedArgs test so
the UDF-derived position stays non-convertible and continues to exercise the
ArrayInsert fallback path. With codegen now enabled by default, the UDF was
converted to proto, making ArrayInsert fully native and removing the expected
fallback reason.

Drop the per-compile log in CometBatchKernelCodegen from info to debug now
that codegen dispatch is on by default and the message would otherwise be
noisy.

Author: andygrove

spark/src/main/scala/org/apache/comet/codegen/CometBatchKernelCodegen.scala

@@ -199,7 +199,7 @@ object CometBatchKernelCodegen extends Logging with CometExprTraitShim {
             t)
           throw t
       }
-    logInfo(
+    logDebug(
       s"CometBatchKernelCodegen: compiled ${boundExpr.getClass.getSimpleName} " +
         s"-> ${boundExpr.dataType}  inputs=" +
         inputSchema

spark/src/test/scala/org/apache/comet/CometArrayExpressionSuite.scala

@@ -236,7 +236,11 @@ class CometArrayExpressionSuite extends CometTestBase with AdaptiveSparkPlanHelp
   test("ArrayInsertUnsupportedArgs") {
     // This test checks that the else branch in ArrayInsert
     // mapping to the comet is valid and fallback to spark is working fine.
-    withSQLConf(CometConf.getExprAllowIncompatConfigKey(classOf[ArrayInsert]) -> "true") {
+    // Disable UDF codegen dispatch so the UDF-derived position remains
+    // non-convertible and forces the ArrayInsert fallback path.
+    withSQLConf(
+      CometConf.COMET_SCALA_UDF_CODEGEN_ENABLED.key -> "false",
+      CometConf.getExprAllowIncompatConfigKey(classOf[ArrayInsert]) -> "true") {
       withTempDir { dir =>
         val path = new Path(dir.toURI.toString, "test.parquet")
         makeParquetFileAllPrimitiveTypes(path, dictionaryEnabled = false, 10000)