[jira] [Commented] (AVRO-2140) Validation of Union Schemas

["Nandor Kollar (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AVRO-2140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16350517#comment-16350517 ] 

Nandor Kollar commented on AVRO-2140:
-------------------------------------

I think this behavior is compliant with the specification: {{Default values for union fields correspond to the first schema in the union.}} Changing this would alter the Avro spec, and would require modification in each language binding.

> Validation of Union Schemas
> ---------------------------
>
>                 Key: AVRO-2140
>                 URL: https://issues.apache.org/jira/browse/AVRO-2140
>             Project: Avro
>          Issue Type: Improvement
>          Components: java
>    Affects Versions: 1.8.2
>            Reporter: Marcos Lopez Gonzalez
>            Priority: Minor
>
> When validating a union Schema in the method
> {code:java}
> Schema.isValidDefault(Schema schema, JsonNode defaultValue){code}
> for the case of UNION it only validates the first type of the union: 
> {code:java}
> case UNION: // union default: first branch
> return isValidDefault(schema.getTypes().get(0), defaultValue);
> {code}
> This leads to some warnings that can create confusion.
> For example, if you have a field like this:
> {code:java}
> {
>   "name" : "synonym",
>   "type" : [ "null", "boolean" ],
>   "default" : false
> }
> {code}
> {{and you assign it false as default you get this warning because it only validates that false is not null:}}
> {code:java}
> [WARNING] Avro: Invalid default for field synonym: false not a ["null","boolean"]{code}
> I think in this cases the validation should check all the types of the union to avoid these warnings.
> I would be happy to create a PR to improve this if you think we should go for it.
>  
>  



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