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https://issues.apache.org/jira/browse/AVRO-1604?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ryan Blue updated AVRO-1604:
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Attachment: AVRO-1604-1.patch
This patch implements the simple solution, to add handling to makeNullable that
checks the schema and either wraps it in a union with null, adds null to an
existing union, or returns the union that already includes null.
The other option is to update Schema.createUnion, but I think the current
behavior is probably intended to catch errors as schemas are built.
> ReflectData.AllowNull fails to generate schemas when @Nullable is present.
> --------------------------------------------------------------------------
>
> Key: AVRO-1604
> URL: https://issues.apache.org/jira/browse/AVRO-1604
> Project: Avro
> Issue Type: Bug
> Reporter: Ryan Blue
> Attachments: AVRO-1604-1.patch
>
>
> The {{@Nullable}} annotation causes a failure because the
> {{makeNullable(Schema)}} method assumes that the type passed in is not
> already a union. When it is a union, either from using {{Nullable}},
> {{AvroSchema}}, or a {{Union}}-annotated type, an exception is thrown that
> unions can't contain unions.
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