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https://issues.apache.org/jira/browse/HIVE-10687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14543746#comment-14543746
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Swarnim Kulkarni commented on HIVE-10687:
-----------------------------------------
Yup. I did try but RB wasn't cooperating. I'll give it a spin again.
> AvroDeserializer fails to deserialize evolved union fields
> ----------------------------------------------------------
>
> Key: HIVE-10687
> URL: https://issues.apache.org/jira/browse/HIVE-10687
> Project: Hive
> Issue Type: Bug
> Components: Serializers/Deserializers
> Reporter: Swarnim Kulkarni
> Assignee: Swarnim Kulkarni
> Attachments: HIVE-10687.1.patch
>
>
> Consider the union field:
> {noformat}
> union {int, string}
> {noformat}
> and now this field evolves to
> {noformat}
> union {null, int, string}.
> {noformat}
> Running it through the avro schema compatibility check[1], they are actually
> compatible which means that the latter could be used to deserialize the data
> written with former. However the avro deserializer fails to do that. Mainly
> because of the way it reads the tags from the reader schema and then reds the
> corresponding data from the writer schema. [2]
> [1] http://pastebin.cerner.corp/31078
> [2]
> https://github.com/cloudera/hive/blob/cdh5.4.0-release/serde/src/java/org/apache/hadoop/hive/serde2/avro/AvroDeserializer.java#L354
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