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https://issues.apache.org/jira/browse/AVRO-2270?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Qing Wang updated AVRO-2270:
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Summary: Can not set non-null type default value for auto generated Arvo
schema with fields have null type (was: Can not set non-null default value for
Auto generated Arvo Schema with field include null type)
> Can not set non-null type default value for auto generated Arvo schema with
> fields have null type
> -------------------------------------------------------------------------------------------------
>
> Key: AVRO-2270
> URL: https://issues.apache.org/jira/browse/AVRO-2270
> Project: Apache Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.8.2
> Reporter: Qing Wang
> Priority: Major
>
> Auto generated Avro schema with fields have union type including null, can
> not be assigned to a non-null default value. The reason is Avro set null as
> the first type in the union .see [the source code
> |https://github.com/apache/avro/blob/master/lang/java/avro/src/main/java/org/apache/avro/reflect/ReflectData.java]
> line 694 // add null as the _first_ type in a new union.
> Based on [https://avro.apache.org/docs/1.8.1/spec.html#Unions], in a union,
> the type of the default value must match the _first_ element of the union.
>
> Not very clear what is the reasons for this design. But in our use case, we
> want some fields to be non mandatory, the auto generated schema would be
> \{"type": ["null", "desired type"]}, in which case we can not set a default
> value with desired type.
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