[jira] [Created] (AVRO-1759) Avro Schema Generator to handle polymorphic types

[Qiangqiang Shi (JIRA)]

Qiangqiang Shi created AVRO-1759:
------------------------------------

             Summary: Avro Schema Generator to handle polymorphic types
                 Key: AVRO-1759
                 URL: https://issues.apache.org/jira/browse/AVRO-1759
             Project: Avro
          Issue Type: Improvement
          Components: java
    Affects Versions: 1.9.0
            Reporter: Qiangqiang Shi


Inheritance and polymorphism are widely used in Java projects and libraries. 
It'll make people's life easier if Avro could detect classes' hierarchy and 
generate Avro schema according to the hierarchy. 

for example, for the following class:

public class TestReflectPolymorphismData {
{
public static class SuperclassA1 {
    private String SuperclassA1;
  }

  public static class SubclassA1 extends SuperclassA1 {
    private String SubclassA1;
  }

  public static class SubclassA2 extends SuperclassA1 {
    private String SubclassA2;
  }

public static class SuperB1 {
    private SubclassA1 SubclassA1;
    private List<SubclassA2> SubclassA2List;
    private Map<String, SuperclassA1> stringSuperclassA1Map;
    private Map<Integer, SuperclassA1> integerSuperclassA1Map;
  }
}
}

Avro should be able to generate a schema like the following one automatically :

{"type":"record","name":"SuperB1","namespace":"org.apache.avro.reflect.TestReflectPolymorphismData$","fields":[{"name":"SubclassA1","type":{"type":"record","name":"SuperclassA1","fields":[{"name":"SuperclassA1","type":"string"},{"name":"SuperclassA1Subclasses","type":["null",{"type":"record","name":"SubclassA1","fields":[{"name":"SubclassA1","type":"string"}]},{"type":"record","name":"SubclassA2","fields":[{"name":"SubclassA2","type":"string"}]}]}]}},{"name":"SubclassA2List","type":{"type":"array","items":"SuperclassA1","java-class":"java.util.List"}},{"name":"stringSuperclassA1Map","type":{"type":"map","values":"SuperclassA1"}},{"name":"integerSuperclassA1Map","type":{"type":"array","items":{"type":"record","name":"Pair34255fab6d3d79ff","namespace":"org.apache.avro.reflect","fields":[{"name":"key","type":"int"},{"name":"value","type":"org.apache.avro.reflect.TestReflectPolymorphismData$.SuperclassA1"}]},"java-class":"java.util.Map"}}]}



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