Clarify resolution for enums (and fix code)
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Key: AVRO-75
URL: https://issues.apache.org/jira/browse/AVRO-75
Project: Avro
Issue Type: Bug
Components: spec
Reporter: Raymie Stata
Assignee: Doug Cutting
The current resolution rule for enum's says: "if the writer's symbol is not
present in the reader's enum, then the enum value is unset." This is the only
place the word "unset" is used in the doc, it's not clear what you mean. The
code seems to be inconsistent: GenericDatumReader will happily return a symbol
the reader doesn't understand; ReflectDatumReader will probably throw a
class-not-found exception; ResolvingDecoder throws an error.
I propose that we declare this case an error, i.e., rewrite the spec to "if the
writer's symbol is not listed in the reader's enum, an error is signaled."
GenericDatumReader should be updated to throw an error in this case.
If we decide to stick with the "unset" language, we need to define what "unset"
means (and, if necessary, update ReflectDatumReader and ResolvingDecoder).
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