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https://issues.apache.org/jira/browse/AVRO-2115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16289918#comment-16289918
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Doug Cutting commented on AVRO-2115:
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+1 This looks like a good fix. @Union should apply to fields as well. This
was an inadvertent omission fixed by the patch at Github linked above.
With this patch Void.class works for optional fields, right? Perhaps we should
add a test for that too?
> Support @Union in members too
> -----------------------------
>
> Key: AVRO-2115
> URL: https://issues.apache.org/jira/browse/AVRO-2115
> Project: Avro
> Issue Type: Improvement
> Reporter: Miguel
> Priority: Minor
>
> Allow defining unions in members:
> {code:java}
> class MyDatum {
> @Nullable
> @Union({String.class, Long.class, Other.class,...})
> Object o;
> }
> {code}
> It can currently be implemented using @AvroSchema like this, but it is seems
> in my oppinion more verbose and more difficult to maintain:
> {code:java}
> @AvroSchema("[\"null\",\"string\",...")
> {code}
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