Michael LeGore created AVRO-3106:
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Summary: Java JsonDecoder does not allow unknown fields in reader
Key: AVRO-3106
URL: https://issues.apache.org/jira/browse/AVRO-3106
Project: Apache Avro
Issue Type: Bug
Components: java
Affects Versions: 1.10.2
Reporter: Michael LeGore
The Java JsonDecoder does not actually allow there to be unknown fields in the
reader compared to the writer's schema. In cases where this happens it gives
the following error:
org.apache.avro.AvroTypeException: Expected Unknown fields: [<field name
redacted>]. Got END_OBJECT
This seems to contradict Avro's [schema resolution
documentation|https://avro.apache.org/docs/current/spec.html#Schema+Resolution]
which states (emphasis mine)
{quote}if both are records:
* the ordering of fields may be different: fields are matched by name.
* schemas for fields with the same name in both records are resolved
recursively.
* *if the writer's record contains a field with a name not present in the
reader's record, the writer's value for that field is ignored.*
* if the reader's record schema has a field that contains a default value, and
writer's schema does not have a field with the same name, then the reader
should use the default value from its field.
* if the reader's record schema has a field with no default value, and
writer's schema does not have a field with the same name, an error is
signalled.{quote}
Looking at the codebase it seems to be happening at this line here:
[https://github.com/apache/avro/blob/589a9be3387aea2ad3c356964256eaff7645c3c2/lang/java/avro/src/main/java/org/apache/avro/io/JsonDecoder.java#L495]
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