Michael Overmeyer created AVRO-1817:
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Summary: Allow enums to be "promoted" to strings
Key: AVRO-1817
URL: https://issues.apache.org/jira/browse/AVRO-1817
Project: Avro
Issue Type: Improvement
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 value.
For example, Colour.RED => "RED", Colour.YELLOW => "YELLOW", Colour.GREEN =>
"GREEN"
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