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https://issues.apache.org/jira/browse/FLINK-28444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17563662#comment-17563662
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LuNing Wang commented on FLINK-28444:
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I would like to take this.
> 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
> Priority: Major
>
> 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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