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https://issues.apache.org/jira/browse/AVRO-1568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14347825#comment-14347825
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ASF GitHub Bot commented on AVRO-1568:
--------------------------------------
GitHub user sachingsachin opened a pull request:
https://github.com/apache/avro/pull/20
AVRO-1568: Allow Java polymorphism in Avro for third-party code
The fix simply adds two APIs to ReflectData:
1) setSchema (Class<?> clazz, Schema s);
2) setSchema (Field field, Schema s);
With these two APIs, clients can create UNION schemas for any class/field
and set them accordingly.
With the UNION schema, avro can easily handle derived objects' presence on
base-class fields.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sachingsachin/avro AVRO-1568
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/avro/pull/20.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #20
----
commit bd63678fae95ec218b7f2b758c02c5c208c9fbbf
Author: Sachin Goyal <[email protected]>
Date: 2015-03-05T00:15:57Z
AVRO-1568: Allow Java polymorphism in Avro for third-party code
The fix simply adds two APIs to ReflectData:
1) setSchema (Class<?> clazz, Schema s);
2) setSchema (Field field, Schema s);
With these two APIs, clients can create UNION schemas for any class/field
and set them accordingly.
With the UNION schema, avro can easily handle derived objects' presence on
base-class fields.
----
> 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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