add union annotation to reflect API
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Key: AVRO-241
URL: https://issues.apache.org/jira/browse/AVRO-241
Project: Avro
Issue Type: Improvement
Components: java
Reporter: Doug Cutting
Assignee: Doug Cutting
Fix For: 1.3.0
In existing Hadoop RPC interfaces one can use an abstract base class or
interface in a method declaration, and then pass different instantiable
subclasses, since Hadoop RPC tags parameters and return types with their
runtime java class name. To permit such interfaces to be supported by Avro
reflection we can add a Union annotation that can be added to the base class,
declaring its instantiable subclasses for Avro.
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