Sam Schlegel created AVRO-2058:
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             Summary: ReflectData#isNonStringMap returns true for 
org.apache.avro.util.Utf8 keys
                 Key: AVRO-2058
                 URL: https://issues.apache.org/jira/browse/AVRO-2058
             Project: Avro
          Issue Type: Bug
          Components: java
    Affects Versions: 1.8.2
            Reporter: Sam Schlegel
            Priority: Critical


Since {{org.apache.avro.util.Utf8}} does not have an 
{{org.apache.reflect.Stringable}} notation, and is not in 
{{org.apache.avro.specific.SpecificData#stringableClasses}}, 
{{ReflectData#isNonStringMap}} returns true. This also causes 
{{ReflectData#isArray}} to return true for maps with Utf8 keys, and thus 
{{GenericData#resolveUnion}} fails as well. This ultimately causes 
{{ReflectData#write}} to fail for schemas that contain a union that contains a 
map, where the data uses Utf8 for strings.



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