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Avro, mail # dev - Schema Resolution for Enums


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Re: Schema Resolution for Enums
Youssef Hatem 2013-09-27, 20:53
It makes perfect sense, thanks a lot Doug.

Youssef

On Sep 27, 2013, at 21:02 , Doug Cutting wrote:

> On Thu, Sep 26, 2013 at 6:29 AM, Youssef Hatem
> <[EMAIL PROTECTED]> wrote:
>> All I can say is that we use the deserialized enum value as it is. So we get zero, which is wrong since zero corresponds to something else in the reader enum.
>
> You need to translate enum values from the writer's to the reader's
> schema.  This is not difficult, since both are present when you're
> reading.  An array can be created that maps each value written into
> the corresponding value in the reader's schema.  In your example this
> would be [1,0,2,3], so that when you read a zero you return a 1.
>
> Doug