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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