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https://issues.apache.org/jira/browse/CALCITE-7186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18020554#comment-18020554
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Yu Xu commented on CALCITE-7186:
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Yes, it's more appropriate to re-frame it as a bug. I added UdfTest, but during
testing, I discovered compatibility issues with the codegen-generated code,
which I've documented: https://issues.apache.org/jira/browse/CALCITE-7187
Byte/byte[] type can't be directly converted to ByteString , and it seems
there's currently no compatibility. However, char/Character[] type can be
converted to VARCHAR.
Therefore, I've made a fix for this issue to adapt the Character[] mapping to
VARCHAR.
> Add mapping from Byte[] to VARBINARY and Character[] to VARCHAR in Java UDF
> ---------------------------------------------------------------------------
>
> Key: CALCITE-7186
> URL: https://issues.apache.org/jira/browse/CALCITE-7186
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.40.0
> Reporter: Yu Xu
> Assignee: Yu Xu
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.41.0
>
>
> Java user-defined function (UDF) UDF functions with *Character[]* and
> *Byte[]* return types are recognized as {*}OTHER{*}, but UDF functions with
> *char[]* and *byte[]* return types are recognized as *VARCHAR* and
> {*}VARBINARY{*}. *Character[]* should be consistent with {*}char[]{*}, and
> *Byte[]* should be consistent with {*}byte[]{*}.
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