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https://issues.apache.org/jira/browse/AVRO-1604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14599963#comment-14599963
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Ryan Blue commented on AVRO-1604:
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[~ericsodt], I think the schema you've generated looks correct. This issue
addressed an error thrown when generating the schema. But your schema appears
to have been generated without errors and looks fine.
The problem that you're hitting is because your JSON doesn't conform to Avro's
[JSON encoding
spec|https://avro.apache.org/docs/1.7.7/spec.html#json_encoding]. The union
should have an extra layer to tell Avro which type in the union should be used.
You can also use other utilities to do this conversion. Kite, for example, has
support for converting non-Avro JSON records to Avro.
> 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
> Assignee: Ryan Blue
> Fix For: 1.8.0
>
> 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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