Gustavo de Morais created FLINK-39602:
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             Summary: Add IS_VALID_UTF8 and MAKE_VALID_UTF8 built-in functions
                 Key: FLINK-39602
                 URL: https://issues.apache.org/jira/browse/FLINK-39602
             Project: Flink
          Issue Type: Sub-task
          Components: Table SQL / API
            Reporter: Gustavo de Morais
            Assignee: Gustavo de Morais


User-facing SQL surface for FLIP-568.
 * {{BuiltInFunctionDefinitions}} - {{IS_VALID_UTF8(BINARY) -> BOOLEAN}} and 
{{{}MAKE_VALID_UTF8(BINARY) -> STRING{}}}.
 * {{BaseExpressions}} - {{BYTES.isValidUtf8()}} and {{BYTES.makeValidUtf8()}} 
Table API methods.{{{}{}}}s.

Strict {{CAST(bytes AS STRING)}} and the legacy migration flag are tracked 
separately as the next sub-task.



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