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https://issues.apache.org/jira/browse/AVRO-3280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17467891#comment-17467891
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Askar Safin commented on AVRO-3280:
-----------------------------------
Note that Avro spec already supports unions with one variant. Such union
mentioned here:
" When no errors are declared, the effective error union is ["string"] "
But I still think the spec should explicitly say that one-variant unions are
supported in section "Schema Declaration"
> What is minimal count of variants in a union?
> ---------------------------------------------
>
> Key: AVRO-3280
> URL: https://issues.apache.org/jira/browse/AVRO-3280
> Project: Apache Avro
> Issue Type: Bug
> Components: spec
> Reporter: Askar Safin
> Priority: Major
>
> What is minimal count of variants in a union? Spec is not clear on this. I
> think minimal count of variants should be zero. Because many programming
> languages support such unions (for example, Rust supports enums without
> variants)
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