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https://issues.apache.org/jira/browse/CALCITE-7073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17986254#comment-17986254
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Julian Hyde commented on CALCITE-7073:
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Can you please change the summary to describe the bug, not the fix. What does a
user see if they run into this bug? Can you provide a SQL test case?
> Fix: Calcite Fails to Map ByteString to VARBINARY
> -------------------------------------------------
>
> Key: CALCITE-7073
> URL: https://issues.apache.org/jira/browse/CALCITE-7073
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Lucas Brenner
> Priority: Minor
> Labels: pull-request-available
>
> Calcite uses {{org.apache.calcite.avatica.util.ByteString}} internally to
> represent {{{}VARBINARY{}}}. However, when introducing a custom function that
> returns {{{}ByteString{}}}, such as {{UNBASE64}} (which decodes a Base64
> string to bytes), its return type defaults to {{{}OTHER{}}}. This occurs
> because there is no explicit mapping for {{ByteString}} in the
> {{JavaToSqlTypeConversionRules}} class.
>
> [This PR|https://github.com/apache/calcite/pull/4440] adds the necessary
> mapping.
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