Anders Sundelin created AVRO-1931:
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Summary: SchemaCompatibility fails to recognize reader compatible
with all branches of a union
Key: AVRO-1931
URL: https://issues.apache.org/jira/browse/AVRO-1931
Project: Avro
Issue Type: Bug
Components: java
Affects Versions: 1.8.1
Environment: Java
Reporter: Anders Sundelin
Priority: Minor
It is stated in the Avro spec
"if writer's is a union, but reader's is not:
If the reader's schema matches the selected writer's schema, it is recursively
resolved against it. If they do not match, an error is signalled."
In case a the chosen reader is compatible with all branches of the union in the
writer, then the class SchemaCompatibility should reflect this. Currently it
does not.
The submitted patch corrects this (also added tests showing this behaviour in
Avro)
The new tests, in the class TestReadingWritingDataInEvolvedSchemas, could be
redundant, but they were very useful when exploring how Avro actually works
during de-/serialization
I will try to continue working a little bit on the SchemaCompatibility class,
adding more user-friendly error messages (suitable for deeper structures than
todays error message). Feel free to contact me if you have any ideas or
pointers to existing work.
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