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https://issues.apache.org/jira/browse/FLINK-39943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18089238#comment-18089238
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Sergey Nuyanzin commented on FLINK-39943:
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also see https://github.com/apache/flink/pull/28170#discussion_r3409380128
> IS [NOT ]JSON changed nullability after upgrade to Calcite 1.38.0
> -----------------------------------------------------------------
>
> Key: FLINK-39943
> URL: https://issues.apache.org/jira/browse/FLINK-39943
> Project: Flink
> Issue Type: Technical Debt
> Components: Table SQL / Planner
> Reporter: Sergey Nuyanzin
> Priority: Major
>
> For now new behavior is disabled however probably need to do some
> investigation and support it as it is more like a SQL way to return {{NULL}}
> if input is {{NULL}}
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