org.apache.avro.generic.GenericData.resolveUnion does not deal correctly with a
union of two records with (different) namespace definitions
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Key: AVRO-1017
URL: https://issues.apache.org/jira/browse/AVRO-1017
Project: Avro
Issue Type: Bug
Components: java
Affects Versions: 1.6.1
Reporter: Joseph Adler
Suppose that you define two different avro objects:
{"name":"A", "namespace":"com.something", "type":"record", ...}
{"name":"B", "namespace":"com.anotherthing", "type":"record", ...}
Then define a union of the two:
{"name":"bothAAndB", "type":[{"name":"A", "namespace":"com.something",
"type":"record", ...},{"name":"B", "namespace":"com.anotherthing",
"type":"record", ...}]}
If you write an object of type A or B into a GenericRecord and try to use
org.apache.avro.generic.GenericDatumWriter to store the object, you will get an
org.apache.avro.UnresolvedUnionException exception.
Very specifically, it looks like org.apache.avro.UnionSchema.getIndexNamed is
being called by org.apache.avro.generic.GenericDatumWriter.resolveUnion with
the short name of the record, but that the org.apache.avro.UnionSchema object
contains the full names of the objects. So,
org.apache.avro.UnionSchema.getIndexNamed doesn't find a match and Avro fails
to find an object in the union that matches the object in the datum.
So... I'd like to see one of two fixes: (1) an informative error message
telling me that I can't form a union of records from different namespaces, or
(2) a successful lookup of the schema and record writing.
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