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https://issues.apache.org/jira/browse/FLINK-39821?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fabian Hueske resolved FLINK-39821.
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Fix Version/s: 2.4.0
Resolution: Fixed
> 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
> Assignee: Ramin Gharib
> Priority: Minor
> Labels: pull-request-available
> Fix For: 2.4.0
>
>
> REGEX_REPLCE now can return null types for invalid patterns but the output
> type is a non-null STRING.
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