Ryan Skraba created AVRO-4322:
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             Summary: [Java] Fast and classic readers change GenericData 
behaviour
                 Key: AVRO-4322
                 URL: https://issues.apache.org/jira/browse/AVRO-4322
             Project: Apache Avro
          Issue Type: Bug
            Reporter: Ryan Skraba


In the past, the schema property {{java-class}} has only applied to 
SpecificData and ReflectData, while GenericData has ignored the property. 

Today the "classic" path ignores java-class annotations and "fast" path reads 
data in this format.   

This is codified in some projects like [Parquet. 
|https://github.com/apache/parquet-java/blob/82414e2a8aa969ad3cc2e3d9569db9f3fca3cd40/parquet-avro/src/test/java/org/apache/parquet/avro/TestStringBehavior.java#L99]We
 should either restore this default behaviour as a regression or note it as a 
breaking change.



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