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https://issues.apache.org/jira/browse/AVRO-1274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13602567#comment-13602567
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Doug Cutting commented on AVRO-1274:
------------------------------------
This should look like:
{"name":"optionalBytesWithDefault", "type":["null", "bytes"], "default":null}
If a field's type is a union, then the type of the default is the type of the
first element in the union. So the only valid default value for a union of the
form ["null", ...] is null. Some other valid examples of unions with defaults
are:
{"name":"f1", "type":["string", "int"], "default":""}
{"name":"f2", "type":["int", "string"], "default":0}
Default values are different than what JsonEncoder would produce. It will
qualify values of a union with their type, rendering {"bytes":"foo"} rather
than just "foo" for a value whose schema is ["bytes", ...]. But default values
are not so qualified.
Does that help?
> Add a schema builder API
> ------------------------
>
> Key: AVRO-1274
> URL: https://issues.apache.org/jira/browse/AVRO-1274
> Project: Avro
> Issue Type: New Feature
> Components: java
> Reporter: Tom White
> Assignee: Tom White
> Attachments: AVRO-1274.patch, AVRO-1274.patch, AVRO-1274.patch
>
>
> It would be nice to have a fluent API that made it easier to construct record
> schemas.
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