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https://issues.apache.org/jira/browse/AVRO-997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14155480#comment-14155480
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Doug Cutting commented on AVRO-997:
-----------------------------------
I still think we're inviting confusion by not consistently requiring that
isEnum() is true of enum values. Things are clearer if we throw exceptions
when folks try to use other types for enum symbols. Automagically accepting
any type whose toString() implementation returns a symbol in the enumeration
only works in some cases. There are cases where a distinct type is required.
Think about documenting this: it gets harder to document if we're more
permissive, and complex documentation is a sign of a confusing API.
> Union of enum and null cannot be serialized
> -------------------------------------------
>
> Key: AVRO-997
> URL: https://issues.apache.org/jira/browse/AVRO-997
> Project: Avro
> Issue Type: Bug
> Affects Versions: 1.5.1
> Reporter: Aaron Kimball
> Assignee: Sean Busbey
> Fix For: 1.8.0
>
> Attachments: AVRO-997.patch, AVRO-997.patch, AVRO-997.patch,
> AVRO-997.permissive-generic-api.patch
>
>
> I have a schema like:
> {code}
> [
> {
> "type": "enum",
> "name": "Gender",
> "symbols": ["M", "F"]
> },
> {
> "type" : "record",
> "name" : "Foo",
> "fields" : [
> { "type" : ["Gender", "null"], "name" : "gender" },
> ...
> ]
> }
> ]
> {code}
> I build a record like {{Foo foo = new Foo(); foo.gender = Gender.M;}}
> When I go to serialize this, I get:
> {code}Not in union
> [{"type":"enum","name":"Gender","symbols":["M","F"]},"null"]: M
> at
> org.apache.avro.generic.GenericData.resolveUnion(GenericData.java:482)
> at
> org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:70)
> at
> org.apache.avro.generic.GenericDatumWriter.writeRecord(GenericDatumWriter.java:104)
> at
> org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:65)
> at
> org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:57)
> {code}
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