Jim Donofrio created AVRO-1340:
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Summary: use default to allow old readers to specify default enum
value when encountering new enum symbols
Key: AVRO-1340
URL: https://issues.apache.org/jira/browse/AVRO-1340
Project: Avro
Issue Type: Improvement
Components: spec
Environment: N/A
Reporter: Jim Donofrio
Priority: Minor
The schema resolution page says:
> if both are enums:
> if the writer's symbol is not present in the reader's enum, then an
error is signalled.
This makes it difficult to use enum's because you can never add a enum value
and keep old reader's compatible. Why not use the default option to refer to
one of enum values so that when a old reader encounters a enum ordinal it does
not recognize, it can default to the optional schema provided one. If the old
schema does not provide a default then the older reader can continue to fail as
it does today.
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