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https://issues.apache.org/jira/browse/AVRO-266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12794258#action_12794258
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Todd Lipcon commented on AVRO-266:
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I think the best solution to this would be to deserialize unions as a tagged
class, with one member field per type plus either an enum, int, or Schema
reference "selectedType" field. We can still provide a .getObject() accessor
which returns java.lang.Object. This would allow really easy reuse of the
constituent records.
> Union as java.lang.Object prevents object reuse
> -----------------------------------------------
>
> Key: AVRO-266
> URL: https://issues.apache.org/jira/browse/AVRO-266
> Project: Avro
> Issue Type: Improvement
> Affects Versions: 1.2.0
> Reporter: Todd Lipcon
>
> Because Unions end up deserializing as java.lang.Object and using the
> object's type to differentiate the union constituents, object reuse is pretty
> hard to achieve. I don't have a specific benchmark, but I think this will
> hurt performance for logging applications where every record in a large file
> is a union, and the type tends to change for each record.
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