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https://issues.apache.org/jira/browse/FLINK-3739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15239051#comment-15239051
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Timo Walther commented on FLINK-3739:
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[~vkalavri] It seems that Calcite needs explicit type conversions for NULL
literals. I adapted my tests. Would be great if you could review it.
> 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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