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https://issues.apache.org/jira/browse/AVRO-1569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14355137#comment-14355137
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Ryan Blue commented on AVRO-1569:
---------------------------------
It looks like this is probably caused by the added union in the schema. I'm not
clear on why your solution, to reflect the data from parents and check those is
the right solution. When resolving the union, we just need to match the
non-null case. Do you know what the two schemas are at that point and why the
match isn't succeeding?
This may be related to AllowNull problems that were fixed earlier but haven't
been released yet. See AVRO-1590.
> ReflectData.AllowNull fails with polymorphism
> ---------------------------------------------
>
> Key: AVRO-1569
> URL: https://issues.apache.org/jira/browse/AVRO-1569
> Project: Avro
> Issue Type: Bug
> Affects Versions: 1.7.6
> Reporter: Sachin Goyal
>
> UnresolvedUnionException is thrown if the following structure is serialized
> with ReflectData.AllowNull
> (Plain ReflectData works fine)
> {code}
> 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());
> {code}
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