ASF GitHub Bot commented on AVRO-1340:

bellemare opened a new pull request #298: AVRO-1340: Added Enum Defaults and 
unit tests.
URL: https://github.com/apache/avro/pull/298
   - Added Enums to Defaults.
   - Enum Defaults are only applied to values which don't match the enum 
   - Enum Defaults do not override any Field Default behaviour. Field Defaults 
are used when a reader reads a datum that does not have the Field defined (as 
is current behaviour).
   To see an example table of this behaviour, see Final Default & Fallback tab 

This is an automated message from the Apache Git Service.
To respond to the message, please log on GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:

> 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.

This message was sent by Atlassian JIRA

Reply via email to