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https://issues.apache.org/jira/browse/AVRO-2115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16290950#comment-16290950
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Doug Cutting commented on AVRO-2115:
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Yes, that should be fixed in the package documentation.
Also, please update the Union.java documentation, adding a sentence like, "A
null schema may be specified with Void.class."
> 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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