[jira] [Created] (FLINK-3497) Add SQL scalar functions to Table API

[Shang Yuanchun (Jira)]

Timo Walther created FLINK-3497:
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             Summary: 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
            Reporter: Timo Walther


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
- Array
- other

Each step includes implementation, test and documentation.



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