[
https://issues.apache.org/jira/browse/AVRO-1340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16394601#comment-16394601
]
Adam Bellemare commented on AVRO-1340:
--------------------------------------
[~cutting], [~felixgv] [~zolyfarkas]
I submitted a PR above. Sorry for the delay, it took me a bit longer than I
thought it would. I did change the implementation a bit as I went - the enum
default is now only used when a unmatching symbol is read by the reader. It
doesn't affect anything when a field is just not found by the reader (that is
still the Field default's responsibility). I didn't the interplay between the
two and the code was getting somewhat gnarly, so I simplified it and went with
what you now see in the PR.
> 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
(v7.6.3#76005)
