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https://issues.apache.org/jira/browse/AVRO-2115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16288851#comment-16288851
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Miguel edited comment on AVRO-2115 at 12/13/17 8:36 AM:
--------------------------------------------------------
That is not allowed. Checking
[https://github.com/apache/avro/blob/master/lang/java/avro/src/main/java/org/apache/avro/reflect/Union.java]:
{code:java}
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE, ElementType.PARAMETER, ElementType.METHOD})
@Documented
public @interface Union {
/** The instantiable classes that compose this union. */
Class[] value();
}
{code}
I tried (without using Void.class).
I omitted the Union annotation where it is needed to add the ElementType.FIELD
target:
{code:java}
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD})
@Documented
public @interface Union {
/** The instantiable classes that compose this union. */
Class[] value();
}
{code}
was (Author: elmendavies):
That is not allowed. Checking
[https://github.com/apache/avro/blob/master/lang/java/avro/src/main/java/org/apache/avro/reflect/Union.java]:
{code:java}
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE, ElementType.PARAMETER, ElementType.METHOD})
@Documented
public @interface Union {
/** The instantiable classes that compose this union. */
Class[] value();
}
{code}
I tried (without using Void.class).
I omitted the FieldUnion annotation where it is needed to add the
ElementType.FIELD target:
{code:java}
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD})
@Documented
public @interface FieldUnion {
/** The instantiable classes that compose this union. */
Class[] value();
}
{code}
> 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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