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Posted to dev@avro.apache.org by "Marcio Silva (JIRA)" <ji...@apache.org> on 2012/11/14 05:12:16 UTC
[jira] [Updated] (AVRO-1204) Schema.createUnion can produce schemas
that aren't parseable due to redefinition of types
[ https://issues.apache.org/jira/browse/AVRO-1204?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Marcio Silva updated AVRO-1204:
-------------------------------
Attachment: 0001-Creating-test-case-to-illustrate-Union-schema-proble.patch
A patch that contains a junit test that illustrates the problem.
> Schema.createUnion can produce schemas that aren't parseable due to redefinition of types
> -----------------------------------------------------------------------------------------
>
> Key: AVRO-1204
> URL: https://issues.apache.org/jira/browse/AVRO-1204
> Project: Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.7.3
> Reporter: Marcio Silva
> Attachments: 0001-Creating-test-case-to-illustrate-Union-schema-proble.patch
>
>
> Schemas returned from {{Schema.createUnion}} aren't always re-parsable (after calling Schema.toString()).
> If you create a union of types that contain multiple references to the same type, the resulting {{Schema}} instance returned can't be written to JSON and then re-parsed due to a SchemaParseException on type redefinition.
> The fix probably involves changes to {{UnionSchema.toJson}} to ensure that any repeated type definitions are replaced by a named reference.
> For a concrete example, the union of the following two schemas is problematic:
> {code:javascript|title=child-schema.avsc}
> {"type":"record",
> "name":"UnionTestChild",
> "namespace":"org.apache.avro",
> "fields":[
> { "name":"intField","type":"int"},
> { "name":"stringField", "type":"string"}
> ]
> }
> {code}
> {code:javascript|title=parent-schema.avsc}
> {
> "type":"record",
> "name":"UnionTestParent",
> "namespace":"org.apache.avro",
> "fields":[
> {
> "name":"child",
> "type":{
> "type":"record",
> "name":"UnionTestChild",
> "namespace":"org.apache.avro",
> "fields":[
> { "name":"intField","type":"int"},
> { "name":"stringField", "type":"string"}
> ]
> }
> }
> ]
> }
> {code}
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