[jira] [Created] (FLINK-39821) Make return type of REGEX_REPLACE nullable

[Ramin Gharib (Jira)]

Ramin Gharib created FLINK-39821:
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             Summary: Make return type of REGEX_REPLACE nullable
                 Key: FLINK-39821
                 URL: https://issues.apache.org/jira/browse/FLINK-39821
             Project: Flink
          Issue Type: Sub-task
            Reporter: Ramin Gharib


REGEX_REPLCE now can return null types for invalid patterns but the output type 
is a non-null STRING. 



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