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https://issues.apache.org/jira/browse/HIVE-3538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13470639#comment-13470639
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Jakob Homan commented on HIVE-3538:
-----------------------------------
Good catch. Let me take a look.
> Avro SerDe can't handle Nullable Enums
> --------------------------------------
>
> Key: HIVE-3538
> URL: https://issues.apache.org/jira/browse/HIVE-3538
> Project: Hive
> Issue Type: Bug
> Reporter: Sean Busbey
> Attachments: HIVE-3538.tests.txt
>
>
> If a field has a schema that unions NULL with an enum, Avro fails to resolve
> the union because Avro SerDe doesn't restore "enumness".
> Since the enum datum is a String, avro internals check the union for a string
> schema, which is not present.
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