LuNing Wang created FLINK-28444:
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Summary: Support SUBSTR without parameter in SQL and Table API
Key: FLINK-28444
URL: https://issues.apache.org/jira/browse/FLINK-28444
Project: Flink
Issue Type: Improvement
Components: API / Python, Table SQL / API
Affects Versions: 1.15.1
Reporter: LuNing Wang
SUBSTR() support without parameter in the doc, but the code only supports
SUBSTR(STRING, INT1) and SUBSTR(STRING, INT1, INT2). We should also support
SUBSTR()
We can use new built-in function stack to rewrite `generateSubString` method.
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