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https://issues.apache.org/jira/browse/AVRO-4273?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ismaël Mejía updated AVRO-4273:
-------------------------------
Fix Version/s: (was: 1.12.2)
1.13.0
> The type of the default value must match with one element of the union
> ----------------------------------------------------------------------
>
> Key: AVRO-4273
> URL: https://issues.apache.org/jira/browse/AVRO-4273
> Project: Apache Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.12.1
> Reporter: Cédric Jäger
> Priority: Minor
> Fix For: 1.13.0
>
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> The actual specification for
> [unions|https://avro.apache.org/docs/++version++/specification/#unions]
> states : "the type of the default value must match with *one* element of the
> union"
> The actual implementation of the GenericData class on [line
> 1338|https://github.com/apache/avro/blob/840dc8139f4b3d1bfa8e8c8f1ac3be949b440634/lang/java/avro/src/main/java/org/apache/avro/generic/GenericData.java#L1338],
> however, checks only for the first element of the union :
> {code:java}
> if (json.isNull() && (field.schema().getType() == Type.NULL
> || (field.schema().getType() == Type.UNION &&
> field.schema().getTypes().get(0).getType() == Type.NULL))) {
> return null;
> } {code}
> This causes a problem when there is a nullable field with a default value of
> null and null is not defined as the first element of the union in the schema.
> Instead, the code should iterate through the elements of the union to check
> if one of them is of type NULL, and return null if it is.
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