comphead commented on code in PR #3036:
URL: https://github.com/apache/datafusion-comet/pull/3036#discussion_r2669818064


##########
spark/src/test/scala/org/apache/comet/CometArrayExpressionSuite.scala:
##########
@@ -871,4 +872,20 @@ class CometArrayExpressionSuite extends CometTestBase with 
AdaptiveSparkPlanHelp
       }
     }
   }
+
+  test("size - respect to legacySizeOfNull") {
+    val table = "t1"
+    withSQLConf(CometConf.COMET_NATIVE_SCAN_IMPL.key -> 
CometConf.SCAN_NATIVE_ICEBERG_COMPAT) {

Review Comment:
   we need to make sure the ansi mode is off here. According to Spark
   
   ```
   This function returns -1 for null input only if spark.sql.ansi.enabled is 
false and spark.sql.legacy.sizeOfNull is true. Otherwise, it returns null for 
null input. With the default settings, the function returns null for null input.
   ```



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