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From "Sachin Goyal (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AVRO-1568) Allow Java polymorphism in Avro for third-party code
Date Fri, 22 Aug 2014 02:21:11 GMT

     [ https://issues.apache.org/jira/browse/AVRO-1568?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sachin Goyal updated AVRO-1568:
-------------------------------

    Issue Type: Improvement  (was: New Feature)
       Summary: Allow Java polymorphism in Avro for third-party code  (was: Allow Java polymorphism
in Avro)

> Allow Java polymorphism in Avro for third-party code
> ----------------------------------------------------
>
>                 Key: AVRO-1568
>                 URL: https://issues.apache.org/jira/browse/AVRO-1568
>             Project: Avro
>          Issue Type: Improvement
>    Affects Versions: 1.7.6
>            Reporter: Sachin Goyal
>
> A large number of Java designs interacting with databases with Hibernate/Couchbase (perhaps,
even otherwise) have Java polymorphism of the form:
> {code:java}
> class Base 
> {
>    Integer a = 5;
> }
> class Derived extends Base
> {
>     String b = "Foo";
> }
> class PolymorphicDO
> {
>    Base b = new Derived();
> }
> {code}
> Jackson handles this kind of field by using annotations such as:
> {code}
> @JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, include = JsonTypeInfo.As.PROPERTY, property
= "@class”)
> {code}
> If such a thing can be added to Avro, all those Java designs could become immediately
usable with Avro. They would also become Hadoop compatible due to AvroSerde.



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