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https://issues.apache.org/jira/browse/AVRO-1449?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Doug Cutting resolved AVRO-1449.
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Resolution: Fixed
Fix Version/s: 1.7.7
Assignee: Doug Cutting
I committed this.
> Check default value's type matches union at schema parse time
> -------------------------------------------------------------
>
> Key: AVRO-1449
> URL: https://issues.apache.org/jira/browse/AVRO-1449
> Project: Avro
> Issue Type: Improvement
> Components: java
> Affects Versions: 1.7.6
> Reporter: Tom White
> Assignee: Doug Cutting
> Fix For: 1.7.7
>
> Attachments: AVRO-1449.patch, AVRO-1449.patch
>
>
> A common Avro mistake is to declare optional fields as follows:
> {noformat}
> "type": ["string", "null"], "default": null
> {noformat}
> This fails at runtime since the default value's type (null) doesn't match the
> type of the first type in the union (string). The correct declaration is:
> {noformat}
> "type": ["null", "string"], "default": null
> {noformat}
> Doug
> [suggested|https://groups.google.com/a/cloudera.org/forum/#!msg/cdk-dev/Xgo5YKEcQ1Q/VkyWP2gnOEMJ]
> that we throw an exception at schema parse time for cases like this. To
> ensure backwards compatibility we could make it optional; tools could emit a
> warning.
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