add java annotation to specify arbitrary schema
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                 Key: AVRO-432
                 URL: https://issues.apache.org/jira/browse/AVRO-432
             Project: Avro
          Issue Type: New Feature
          Components: java
    Affects Versions: 1.3.0
            Reporter: Doug Cutting
             Fix For: 1.3.1


HDFS now includes a class (HdfsFileStatus) with a field (symlink) whose type is 
byte[] but which is null for non-symlinks.  For most other types, we could 
annotate this with something like @Union({Void.class, Foo.class}) to declare 
that the field may be null.  But there is unfortunately no way to refer to the 
class of byte[] in an annotation.  So, instead, I propose to add an annotation 
that permits the specification of an arbitrary schema.  In this case, the 
annotation would then be @AvroSchema("[\"null\",\bytes\"").

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