update two tests

Author: mbutrovich

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

@@ -252,7 +252,7 @@ class CometArrayExpressionSuite extends CometTestBase with AdaptiveSparkPlanHelp
           .withColumn("arrUnsupportedArgs", expr("array_insert(arr, idx, 1)"))
         checkSparkAnswerAndFallbackReasons(
           df.select("arrUnsupportedArgs"),
-          Set("codegen dispatch disabled", "unsupported arguments for ArrayInsert"))
+          Set("ScalaUDF has no native path", "unsupported arguments for ArrayInsert"))
       }
     }
   }

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

@@ -65,19 +65,19 @@ class CometIcebergRewriteActionSuite extends CometTestBase with CometIcebergTest
   }
 
   // Single-column zOrder is bit-pattern-equivalent to a natural sort (no second dimension to
-  // interleave with), so we expect the same ascending output as the sort test. The shuffle here
-  // is CometColumnarExchange rather than CometExchange because the z-value column is computed
-  // by a Spark Project (Iceberg's INTERLEAVE_BYTES / INT_ORDERED_BYTES are not recognised by
-  // Comet), so the path crosses a JVM-row boundary before the shuffle.
-  test("single-column zOrder rewrite runs scan, columnar exchange, and sort natively in Comet") {
+  // interleave with), so we expect the same ascending output as the sort test. Iceberg's
+  // `INT_ORDERED_BYTES` / `INTERLEAVE_BYTES` are `ScalaUDF`s that route through Comet's codegen
+  // dispatcher, so the project stays native and the shuffle picks `CometExchange` /
+  // `CometNativeShuffle` rather than the columnar-row roundtrip path.
+  test("single-column zOrder rewrite runs scan, native exchange, and sort natively in Comet") {
     runRewriteTest(
       RewriteCase(
         table = s"$catalog.db.zorder_test",
         configureMode = invoke(_, "zOrder", classOf[Array[String]] -> Array("id")),
         verifyDataAfter = assertSortedById,
         verifyPlans = { rewritePlans =>
           assertReadsAreComet(rewritePlans)
-          assertOperator(rewritePlans, "CometColumnarExchange")
+          assertOperator(rewritePlans, "CometExchange")
           assertOperator(rewritePlans, "CometSort")
         }))
   }