Joao Antonio created AVRO-3913:
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Summary: Optional fields should not require a default value set to
null
Key: AVRO-3913
URL: https://issues.apache.org/jira/browse/AVRO-3913
Project: Apache Avro
Issue Type: Bug
Components: java
Reporter: Joao Antonio
The Avro Schema Specification states that when a field has type Union, the type
of its default value must match the first type in the Union. This quite useful
when defining optional fields, we just need to define the Field type as Union
and place the null type in the first index of the type array.
When parsing an Avro Schema represented in JSON with the Schema.Parser class,
one has to set the field _default_ to {_}null{_}, even with the type is defined
as Union and _null_ is in the first index of the type array.
The Schema.Parser should handle this corner case gracefully and allow omitting
the default value key for fields with type Union and its first type {_}null{_}.
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