wuchong commented on a change in pull request #13634:
URL: https://github.com/apache/flink/pull/13634#discussion_r509264169



##########
File path: 
flink-formats/flink-avro/src/test/java/org/apache/flink/formats/avro/AvroRowDataDeSerializationSchemaTest.java
##########
@@ -198,4 +198,38 @@ public void testSpecificType() throws Exception {
                Assert.assertEquals("12:12:12", 
DataFormatConverters.LocalTimeConverter.INSTANCE.toExternal(
                                rowData.getInt(2)).toString());
        }
+
+       @Test
+       public void testNullableMapType() throws Exception {

Review comment:
       We don't need to add such a big test. You can just add a null entry to 
the `map` in the `testSerializeDeserialize`. 




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