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https://issues.apache.org/jira/browse/HIVE-3528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13582664#comment-13582664
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Michael Malak commented on HIVE-3528:
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As noted in the first comment from
https://issues.apache.org/jira/browse/HIVE-1287, casting to a STRUCT is not
currently supported.
However, I did just now try casting individual fields of a STRUCT and that
indeed does work.
I just now added details to the JIRA that I created last week.
https://issues.apache.org/jira/browse/HIVE-4022
> Avro SerDe doesn't handle serializing Nullable types that require access to a
> Schema
> ------------------------------------------------------------------------------------
>
> Key: HIVE-3528
> URL: https://issues.apache.org/jira/browse/HIVE-3528
> Project: Hive
> Issue Type: Bug
> Components: Serializers/Deserializers
> Reporter: Sean Busbey
> Assignee: Sean Busbey
> Labels: avro
> Fix For: 0.11.0
>
> Attachments: HIVE-3528.1.patch.txt, HIVE-3528.2.patch.txt
>
>
> Deserialization properly handles hiding Nullable Avro types, including
> complex types like record, map, array, etc. However, when Serialization
> attempts to write out these types it erroneously makes use of the UNION
> schema that contains NULL and the other type.
> This results in Schema mis-match errors for Record, Array, Enum, Fixed, and
> Bytes.
> Here's a [review board of unit tests that express the
> problem|https://reviews.apache.org/r/7431/], as well as one that supports the
> case that it's only when the schema is needed.
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