Roger created AVRO-2707:
---------------------------
Summary: union reading does not use first matching member
Key: AVRO-2707
URL: https://issues.apache.org/jira/browse/AVRO-2707
Project: Apache Avro
Issue Type: Bug
Reporter: Roger
[Here|https://gist.github.com/rogpeppe/5faf971eec51f3dbd316bb71d6d5dccc] is a
JSON representation of a test case that produces unexpected behaviour under the
Java Avro implementation.
The test verifies that the JSON data in inData with encoding inSchema produces
outData when read as outSchema.
The specification says: "The first schema in the reader's union that matches
the selected writer's union schema" which to me says that the output should be
a long, because long is before int in the reader's union and long matches int.
To reproduce on the command line, you'll need a version of avro-tools with
[this PR applied|https://github.com/apache/avro/pull/785], then run:
echo '{"F":{"int":999}}' |
avro fromjson --schema
'{"name":"R","type":"record","fields":[{"name":"F","type":["int","string"],"default":1234}]}'
- |
avro tojson --reader-schema
'{"name":"R","type":"record","fields":[{"name":"F","type":["long","int","string"],"default":1234}]}'
-
This prints:
{"F":{"int":999}}
but I'd expect to see this:
{"F":{"long":999}}
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