ying-hua opened a new issue, #11229:
URL: https://github.com/apache/inlong/issues/11229
### Description
- parent #10796
- flinkSql doc:
https://nightlies.apache.org/flink/flink-docs-master/docs/dev/table/functions/systemfunctions/
- ELT(index, expr[, exprs]*)
Returns the index-th expression. index must be an integer between 1 and the
number of expressions.
Retuens NULL if index is NULL or out of range.
### Use case
_No response_
### Are you willing to submit PR?
- [X] Yes, I am willing to submit a PR!
### Code of Conduct
- [X] I agree to follow this project's [Code of
Conduct](https://www.apache.org/foundation/policies/conduct)
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