yux created FLINK-35985:
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Summary: SUBSTRING function not available in transform rules
Key: FLINK-35985
URL: https://issues.apache.org/jira/browse/FLINK-35985
Project: Flink
Issue Type: Bug
Components: Flink CDC
Reporter: yux
Currently, one could not write `SUBSTRING(str FROM idx FOR len)` in the way
that suggested in the doumentations[1], while the workable function,
`SUBSTR(str, idx, len)`, isn't mentioned anywhere.
Either the code or the docs needs update to avoid confusing users.
[1]
https://nightlies.apache.org/flink/flink-cdc-docs-release-3.1/docs/core-concept/transform/
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