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https://issues.apache.org/jira/browse/FLINK-4598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15473200#comment-15473200
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Jark Wu commented on FLINK-4598:
--------------------------------
You are right. We should evaluate what functions should be supported in Table
API (functions user asked or used often). It seems that {{NULLIF}} is a
little-know function, I can close this issue if users rarely use it.
> Support NULLIF in Table API
> ----------------------------
>
> Key: FLINK-4598
> URL: https://issues.apache.org/jira/browse/FLINK-4598
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Reporter: Jark Wu
> Assignee: Jark Wu
>
> This could be a subtask of [FLINK-4549]. As Flink SQL has supported
> {{NULLIF}} implicitly. We should support it in Table API.
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