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https://issues.apache.org/jira/browse/AVRO-2369?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Kulp resolved AVRO-2369.
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Resolution: Fixed
Assignee: Daniel Kulp
I added a Field.NULL_DEFAULT_VALUE object that can be used to specify that a
null should be set as the default for the union. Not the greatest solution,
but I was struggling to find any alternative that wouldn't cause a gigantic
migration issue.
> Provide external way to construct Schema.Field with default value of 'null'
> ---------------------------------------------------------------------------
>
> Key: AVRO-2369
> URL: https://issues.apache.org/jira/browse/AVRO-2369
> Project: Apache Avro
> Issue Type: Task
> Components: java
> Reporter: Ivan Greene
> Assignee: Daniel Kulp
> Priority: Blocker
> Fix For: 1.9.0
>
>
> After making the Schema.Field constructor which takes the default value as a
> JsonNode was made package private, there is no external way to construct a
> field that has a default value of 'null'. Internally that constructor will
> call {{JacksonUtils.toJsonNode(defaultValue)}}, which will return 'null' when
> passed null, and the resulting Field will not have a default value (the json
> node would need to be NullNode instead of simply null itself). This will
> affect projects that need a way to dynamically build schemas and their fields.
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