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https://issues.apache.org/jira/browse/FLINK-13284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16887560#comment-16887560
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Jingsong Lee commented on FLINK-13284:
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Maybe Jira title should be Correct some builtin time functions' return type
inference in Blink planner?
> Correct some builtin functions' return type inference in Blink planner
> ----------------------------------------------------------------------
>
> Key: FLINK-13284
> URL: https://issues.apache.org/jira/browse/FLINK-13284
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Affects Versions: 1.9.0
> Reporter: lincoln lee
> Assignee: lincoln lee
> Priority: Major
> Fix For: 1.9.0
>
>
> Several builtin functions in Blink planner such as
> {code:java}
> DATE_FORMAT{code}
> declares
> {code:java}
> ReturnTypes.cascade(ReturnTypes.explicit(SqlTypeName.VARCHAR),
> SqlTypeTransforms.TO_NULLABLE){code}
> which should be
> {code:java}
> ReturnTypes.cascade(ReturnTypes.explicit(SqlTypeName.VARCHAR),
> SqlTypeTransforms.FORCE_NULLABLE){code}
> instead.
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