[
https://issues.apache.org/jira/browse/AVRO-1340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16420496#comment-16420496
]
Adam Bellemare commented on AVRO-1340:
--------------------------------------
[~cutting] -
What do you think of the IDL format of:
enum \{A,B,C} = C
to specify the default?
That being said, I tried to get it to work for a few hours with idl.jj, but I
am very unfamiliar with the tokenizer and compiler and came up empty handed. I
may want to pass this part off to someone who understands that part of the
system better.
> 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)
