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https://issues.apache.org/jira/browse/AVRO-1817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15219902#comment-15219902
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Sean Busbey commented on AVRO-1817:
-----------------------------------
I can't think of anything this would break, and I'm kind of surprised it's not
already handled.
Interested in putting up a patch [~movermeyer]?
> Allow enums to be "promoted" to strings
> ---------------------------------------
>
> Key: AVRO-1817
> URL: https://issues.apache.org/jira/browse/AVRO-1817
> Project: Avro
> Issue Type: Improvement
> Components: java, spec
> Reporter: Michael Overmeyer
> Priority: Minor
>
> We should consider adding a resolution rule that can promote an enum to a
> string using the enum's symbol.
> I have an Avro schema that has a field with an enum type. However, I have
> realized that an enum is not the type I actually wanted. I would much rather
> have the type of the field be a string. I went to change this, but of course
> this type of change (enum -> string) is not within the bounds of Avro's
> schema evolution. Therefore a reader with this changed schema is not be able
> to read an object written with the old schema.
> For example, if the writer schema was:
> enum Colour {
> RED, YELLOW, GREEN
> }
> protocol stoplight {
> Colour colour;
> }
> And the reader schema was:
> protocol stoplight {
> string colour;
> }
> Then when you access the colour field of your object, you get the string
> representation of the enum value's symbol .
> For example, Colour.RED => "RED", Colour.YELLOW => "YELLOW", Colour.GREEN =>
> "GREEN"
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