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https://issues.apache.org/jira/browse/FLINK-21911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17337298#comment-17337298
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Sergey Nuyanzin commented on FLINK-21911:
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yes, i have a branch for these changes however still need to fix some small
issues before opening a PR
https://github.com/snuyanzin/flink/tree/greatest
> Support arithmetic MIN/MAX in SQL
> ---------------------------------
>
> Key: FLINK-21911
> URL: https://issues.apache.org/jira/browse/FLINK-21911
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / API
> Reporter: Timo Walther
> Priority: Major
>
> We should discuss if we want to support math MIN / MAX in Flink SQL. It seems
> also other vendors do not support it out of the box:
> [https://stackoverflow.com/questions/124417/is-there-a-max-function-in-sql-server-that-takes-two-values-like-math-max-in-ne]
> But it might be quite useful and a common operation in JVM languages.
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