Map lookup behavior is ill-defined in Java
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                 Key: AVRO-897
                 URL: https://issues.apache.org/jira/browse/AVRO-897
             Project: Avro
          Issue Type: Bug
    Affects Versions: 1.5.1
            Reporter: Garrett Wu


In Java, an Avro {{"map"}} is a Java {{Map}}.  The map keys are type 
{{"string"}}, which maps to a Java {{CharSequence}}.

Clients must know to use {{Utf8}} objects when calling {{get()}} or 
{{containsKey()}}.  Instead, {{GenericDatumReader}} should instantiate a 
{{Map}} instance with a {{Comparator}} suitable for comparing any type of 
{{CharSequence}}.

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