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https://issues.apache.org/jira/browse/FLINK-38069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18003969#comment-18003969
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Dylan He commented on FLINK-38069:
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[~snuyanzin] https://github.com/apache/flink/pull/26767#issuecomment-3049045189
> The nullability of function ENCODE return type differs in Table API and SQL
> ---------------------------------------------------------------------------
>
> Key: FLINK-38069
> URL: https://issues.apache.org/jira/browse/FLINK-38069
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / API
> Reporter: Dylan He
> Priority: Major
> Attachments: Snipaste_2025-07-09_11-28-33.png
>
>
> The definition of return type nullability is different in
> `BuiltInFunctionDefinitions#ENCODE` and `FlinkSqlOperatorTable#ENCODE`. The
> same issue applies to DECODE.
> The test in the attached image will pass, clearly the nullability differs in
> Table API and SQL.
> I think we should unify them to enforce nullable return types. And there may
> exist similar diffs in other functions, though I haven't checked yet.
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