wuchong commented on a change in pull request #14085:
URL: https://github.com/apache/flink/pull/14085#discussion_r530309638



##########
File path: 
flink-formats/flink-avro/src/main/java/org/apache/flink/formats/avro/RowDataToAvroConverters.java
##########
@@ -67,13 +67,28 @@ public static RowDataToAvroConverter 
createConverter(LogicalType type) {
                final RowDataToAvroConverter converter;
                switch (type.getTypeRoot()) {
                case NULL:
-                       converter = (schema, object) -> null;
+                       converter = new RowDataToAvroConverter() {

Review comment:
       Could we add `@SuppressWarnings("Convert2Lambda")` annotation to the 
method? This can avoid warning in the IDEA. Besides, it would be better to add 
`serialVersionUID` to the `RowDataToAvroConverter`. 




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