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https://issues.apache.org/jira/browse/AVRO-966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13169214#comment-13169214
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Himanshu Mishra commented on AVRO-966:
--------------------------------------
It fails in case of a "map" too
> Bug in GenericData#resolveUnion when resolving union of null and array
> ----------------------------------------------------------------------
>
> Key: AVRO-966
> URL: https://issues.apache.org/jira/browse/AVRO-966
> Project: Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.6.1
> Reporter: Vyacheslav Zholudev
> Assignee: Doug Cutting
> Fix For: 1.6.2
>
> Attachments: AVRO-966-2.patch, AVRO-966.patch, AVRO-966.patch
>
>
> I have a simple avro schema from which I generate an avro specific object:
> {{
> {"type": "record",
> "name": "org.company.Test",
> "fields": [
> { "name": "arr","type": ["null", {"type": "array","items": "float" }],
> "default": null }
> ]
> }
> }}
> Then a simple piece of code to reproduce a bug:
> {{
> Test test = new Test();
> List<Float> list = new ArrayList<Float>();
> list.add(1.1f);
> list.add(2.2f);
> test.setArr(list);
>
> DataFileWriter<Test> myWriter = new DataFileWriter<Test>(new
> ReflectDatumWriter(test.getSchema()));
> File f = new File("/tmp/test.avro");
> myWriter.create(test.getSchema(), f);
> myWriter.append(test);
> myWriter.close();
> }}
> I get an exception:
> {{
> Exception in thread "main"
> org.apache.avro.file.DataFileWriter$AppendWriteException:
> org.apache.avro.UnresolvedUnionException: Not in union
> ["null",{"type":"array","items":"float"}]: [1.1, 2.2]
> at org.apache.avro.file.DataFileWriter.append(DataFileWriter.java:261)
> <my code>
> Caused by: org.apache.avro.UnresolvedUnionException: Not in union
> ["null",{"type":"array","items":"float"}]: [1.1, 2.2]
> at
> org.apache.avro.generic.GenericData.resolveUnion(GenericData.java:549)
> at
> org.apache.avro.generic.GenericDatumWriter.resolveUnion(GenericDatumWriter.java:137)
> at
> org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:70)
> at
> org.apache.avro.reflect.ReflectDatumWriter.write(ReflectDatumWriter.java:102)
> at
> org.apache.avro.generic.GenericDatumWriter.writeRecord(GenericDatumWriter.java:105)
> at
> org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:65)
> at
> org.apache.avro.reflect.ReflectDatumWriter.write(ReflectDatumWriter.java:102)
> at
> org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:57)
> at org.apache.avro.file.DataFileWriter.append(DataFileWriter.java:255)
> }}
> My investigation showed that in {{GenericData#resolveUnion}} method
> {{getSchemaName()}} is called. And the latter method when checks whether
> {{datum}} is a record, succeeds. Why it happens boils down to the fact that
> in {{ReflectData#createSchema}} an "if"-body under case {{(type instanceof
> ParameterizedType)}} is not executed.
> I can supply more details if needed. Or explain in a clear way if I didn't
> manage to.
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