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https://issues.apache.org/jira/browse/FLINK-39623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18079984#comment-18079984
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Sergey Nuyanzin commented on FLINK-39623:
-----------------------------------------
Merged as
[d1e3d13de8a099f045c7d292a26d6e8d48c53766|https://github.com/apache/flink/commit/d1e3d13de8a099f045c7d292a26d6e8d48c53766]
> Strict UTF-8 validation in CAST(BYTES AS STRING)
> ------------------------------------------------
>
> Key: FLINK-39623
> URL: https://issues.apache.org/jira/browse/FLINK-39623
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / API
> Reporter: Gustavo de Morais
> Assignee: Gustavo de Morais
> Priority: Major
> Labels: pull-request-available
>
> Implements the CAST behavior change from FLIP-568.
> {{CAST(bytes AS STRING)}} (and {{{}VARCHAR{}}}/{{{}CHAR(n){}}} targets) now
> validates UTF-8 and throws on invalid input, instead of silently substituting
> {{{}U+FFFD{}}}.
> *Migration:*
> * {{MAKE_VALID_UTF8(bytes)}} for lenient decode
> * {{TRY_CAST(bytes AS STRING)}} for {{NULL}} on failure
> * {{table.exec.legacy-bytes-to-string-cast=true}} to restore old behavior
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