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https://issues.apache.org/jira/browse/FLINK-3497?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fabian Hueske closed FLINK-3497.
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Resolution: Fixed
Assignee: Timo Walther
Closing. All sub issues have been resolved.
> Add SQL scalar functions to Table API
> -------------------------------------
>
> Key: FLINK-3497
> URL: https://issues.apache.org/jira/browse/FLINK-3497
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Timo Walther
> Priority: Major
>
> In order to use the Table API as ETL tool and prepare for FLINK-2099, we need
> to add more scalar functions such as {{trim()}}, {{abs()}}, {{like()}}, etc.
> Calcite implements the most important functions. We can basically forward
> calls to Calcites built-in runtime functions. Some functions need special
> treatment because of Flink specifics.
> I would propose the following steps:
> - Implement TRIM, SUBSTRING as reference design
> - remaining string functions
> - math functions
> - Date/time functions
> - System functions
> - Case function
> - Array functions
> - other
> Each step includes implementation, test and documentation.
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