[AVRO-1569] ReflectData.AllowNull fails with polymorphism

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.7.6
• Component/s: java
• Assignee: Unassigned
• Reporter: Sachin Goyal
• Created: 22/Aug/14 04:25
• Updated: 30/Dec/18 04:17

Description

UnresolvedUnionException is thrown if the following structure is serialized with ReflectData.AllowNull
(Plain ReflectData works fine)

class Base 
{
   Integer a = 5;
}

class Derived extends Base
{
    String b = "Foo";
}

class PolymorphicDO
{
   Base obj = new Derived();
}

// Serialization code:
ReflectData rdata = ReflectData.AllowNull.get();
Schema schema = rdata.getSchema(PolymorphicDO.class);
ReflectDatumWriter<T> datumWriter = new ReflectDatumWriter (PolymorphicDO.class, rdata);
DataFileWriter<T> fileWriter = new DataFileWriter<T> (datumWriter);
fileWriter.create(schema, new ByteArrayOutputStream());
fileWriter.append(new PolymorphicDO());

Issue Links

• is related to: AVRO-1570 ReflectData.AllowNull fails with polymorphism and @Union annotation
• relates to: AVRO-1568 Allow Java polymorphism in Avro for third-party code