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https://issues.apache.org/jira/browse/AVRO-3625?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Tzvetanov Grigorov reassigned AVRO-3625:
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> [Rust] UnionSchema.is_nullable() should return true if any of the variants is 
> Schema::Null
> ------------------------------------------------------------------------------------------
>
>                 Key: AVRO-3625
>                 URL: https://issues.apache.org/jira/browse/AVRO-3625
>             Project: Apache Avro
>          Issue Type: Bug
>          Components: rust
>    Affects Versions: 1.11.1
>            Reporter: Martin Tzvetanov Grigorov
>            Assignee: Martin Tzvetanov Grigorov
>            Priority: Minor
>
> Currently UnionSchema::is_nullable() returns `true` if the first variant is 
> `"null"`.
> The specification 
> [says|https://avro.apache.org/docs/1.11.1/specification/#unions]: "Thus, for 
> unions containing “null”, the “null” is usually listed first, since the 
> default value of such unions is typically null."
> That is, the `null` is *usually* at the first position{*},{*} but this is not 
> mandatory!



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