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https://issues.apache.org/jira/browse/AVRO-3649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17620991#comment-17620991
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Christophe Le Saec commented on AVRO-3649:
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I wonder if it could not be better to make union type agnostic of its inner
type order. Strictly speaking int|string is same as string|int (and null|int ==
int|null).
In order to do that, i build [this PR|https://github.com/apache/avro/pull/1922]
just to show how it could be done and make discussion easier ({_}if this lead
is good, i should clean some part of code, with Schema.isValidDefault (or
isValidValue) and also add specific unit test on it{_})
> [JAVA] reorder union types to match default value
> -------------------------------------------------
>
> Key: AVRO-3649
> URL: https://issues.apache.org/jira/browse/AVRO-3649
> Project: Apache Avro
> Issue Type: Improvement
> Reporter: Daniel Heinrich
> Priority: Trivial
> Labels: pull-request-available
> Time Spent: 20m
> Remaining Estimate: 0h
>
> The Avro specification requires that a default value matches the first schema
> of a union type.
>
> Using @Nullable on a field will return a union type of the form ["null",
> "<something>"].
> @Nullable also sets the default value to "null".
>
> It is not possible to override this default value with
> {color:#bbb529}{color:#172b4d}@AvroDefault because of the order of the
> schemas in the generated union.{color}
> {color}
>
> It would be nice that union types are automatically reordered to match the
> type of the provided default value.
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