Github user tragicjun commented on a diff in the pull request:

    https://github.com/apache/flink/pull/6082#discussion_r193132257
  
    --- Diff: 
flink-formats/flink-avro/src/main/java/org/apache/flink/formats/avro/typeutils/AvroRecordClassConverter.java
 ---
    @@ -73,9 +75,37 @@ private AvroRecordClassConverter() {
                        final GenericTypeInfo<?> genericTypeInfo = 
(GenericTypeInfo<?>) extracted;
                        if (genericTypeInfo.getTypeClass() == Utf8.class) {
                                return BasicTypeInfo.STRING_TYPE_INFO;
    +                   } else if (genericTypeInfo.getTypeClass() == Map.class) 
{
    --- End diff --
    
    could you explain more about this? I didn't find any coupling between 
AvroRecordClassConverter and AvroRow(De)SerializationSchema. But I did 
encounter "UTF8<->String" cast problem during my integration which I was not 
sure if I should open a separate issue.


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