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https://issues.apache.org/jira/browse/AVRO-432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12838630#action_12838630
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Doug Cutting commented on AVRO-432:
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The patch also removes a useless loop and fixes a case when handling
parameterized types.
> add java annotation to specify arbitrary schema
> -----------------------------------------------
>
> 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
>
> Attachments: AVRO-432.patch
>
>
> 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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