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https://issues.apache.org/jira/browse/FLINK-3739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15240977#comment-15240977
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ASF GitHub Bot commented on FLINK-3739:
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Github user twalthr commented on the pull request:
https://github.com/apache/flink/pull/1880#issuecomment-209880906
There are no silly questions ;-)
SQL fully integrates NULL in all its operators. So we should also allow it
in our APIs as our runtime allows it anyway. You need it for e.g. `CASE b WHEN
1 THEN 11 WHEN 2 THEN 4 ELSE NULL END`
> Add a null literal to Table API
> -------------------------------
>
> Key: FLINK-3739
> URL: https://issues.apache.org/jira/browse/FLINK-3739
> Project: Flink
> Issue Type: Improvement
> Components: Table API
> Reporter: Timo Walther
> Assignee: Timo Walther
>
> The Table API needs support for the null literal e.g. for passing null values
> to functions.
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