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https://issues.apache.org/jira/browse/CALCITE-6079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17916555#comment-17916555
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xiong duan commented on CALCITE-6079:
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CALCITE-6711 has fixed this issue.
> SqlOperatorTest should check that expressions that return NULL have a
> nullable type
> -----------------------------------------------------------------------------------
>
> Key: CALCITE-6079
> URL: https://issues.apache.org/jira/browse/CALCITE-6079
> Project: Calcite
> Issue Type: Improvement
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Priority: Major
>
> {{SqlOperatorTest}} should check that expressions that return NULL have a
> nullable type. This can be done by extending
> {{SqlOperatorTestFixture.checkNull}} to look at the type.
> We will probably catch a few operators whose type-inference strategy is
> slightly off. Looks like {{{}REGEXP_EXTRACT_ALL{}}}, {{{}CHR{}}},
> {{TO_CODE_POINTS}} have some problems.
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