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https://issues.apache.org/jira/browse/CALCITE-6572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17881124#comment-17881124
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Norman Jordan commented on CALCITE-6572:
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There are quite a few tests here.
[https://github.com/apache/calcite/blob/main/testkit/src/main/java/org/apache/calcite/test/SqlOperatorTest.java#L4909]
I'll add another test for when the first argument is *NULL* without a cast.
> Calcite TO_CHAR function is incorrectly marked as returning a non-nullable
> result
> ---------------------------------------------------------------------------------
>
> Key: CALCITE-6572
> URL: https://issues.apache.org/jira/browse/CALCITE-6572
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.37.0
> Reporter: Claude Brisson
> Assignee: Norman Jordan
> Priority: Minor
>
> We would expect the result of TO_CHAR(<date or timestamp>, <format>) to be
> nullable, while it is not for now.
>
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