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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:
----------------------------
Description:
Auto generated Avro schema with fields have union type including null, can not
be assigned to a non-null type 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"]. Due to the issue mentioned above, we can not
set a default value with desired type.
was:
Auto generated Avro schema with fields have union type including null, can not
be assigned to a non-null type 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.
> 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 type 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"]. Due to the issue mentioned above, we can
> not set a default value with desired type.
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