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https://issues.apache.org/jira/browse/FLINK-38027?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Nuyanzin resolved FLINK-38027.
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Fix Version/s: 2.2
Resolution: Fixed
> Apply simplify for watermark expressions
> ----------------------------------------
>
> Key: FLINK-38027
> URL: https://issues.apache.org/jira/browse/FLINK-38027
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Reporter: Sergey Nuyanzin
> Assignee: Sergey Nuyanzin
> Priority: Major
> Fix For: 2.2
>
>
> Currently watermark expressions are not simplified
> for instance
> {code:sql}
> `ts` - ( - ( - (INTERVAL '10' SECOND))),
> `ts` - ARRAY[INTERVAL '10' SECOND, INTERVAL '1' SECOND][1],
> `ts` - CASE WHEN true THEN INTERVAL '10' SECOND ELSE INTERVAL '2' SECOND END
> {code}
> every row could be simplified to
> {code:sql}
> `ts` - INTERVAL '10' SECOND
> {code}
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