hackergin commented on code in PR #24106:
URL: https://github.com/apache/flink/pull/24106#discussion_r1465413612


##########
flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/extraction/BaseMappingExtractor.java:
##########
@@ -362,7 +363,17 @@ static Optional<FunctionArgumentTemplate> 
tryExtractInputGroupArgument(
             Method method, int paramPos) {
         final Parameter parameter = method.getParameters()[paramPos];
         final DataTypeHint hint = parameter.getAnnotation(DataTypeHint.class);
-        if (hint != null) {
+        final ArgumentHint argumentHint = 
parameter.getAnnotation(ArgumentHint.class);
+        if (hint != null && argumentHint != null) {
+            throw extractionError(
+                    "ArgumentHint and DataTypeHint cannot be declared at the 
same time.");

Review Comment:
   parameters.getName can't get the real param name. I use position index 
instread. 



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