Cédric Jäger created AVRO-4273:
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Summary: 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
Fix For: 1.12.2
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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