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https://issues.apache.org/jira/browse/FLINK-35987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17871888#comment-17871888
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lincoln lee commented on FLINK-35987:
-------------------------------------
[~dylanhz] You can take `ItemAtIndexArgumentTypeStrategy` as an example,
validate those literal index values which was actually negative integer.
> Add ELT function
> ----------------
>
> Key: FLINK-35987
> URL: https://issues.apache.org/jira/browse/FLINK-35987
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / API
> Reporter: Dylan He
> Assignee: Dylan He
> Priority: Major
> Labels: pull-request-available
>
> Add ELT function.
> ----
> Returns the {{index}}-th expression.
> Example:
> {code:sql}
> > SELECT ELT(1, 'scala', 'java');
> scala
> {code}
> Syntax:
> {code:sql}
> ELT(index, expr...)
> {code}
> Arguments:
> * {{index}}: An INTEGER expression.
> * {{expr}}: A STRING or BINARY expression. One expr is required as least.
> Returns:
> The result has the type of the least common type of all {{expr}}.
> {{index}} must be between 1 and the number of {{expr}}. Otherwise, the
> function returns an error.
> See also:
> *
> [Spark|https://spark.apache.org/docs/3.5.1/sql-ref-functions-builtin.html#string-functions]
> *
> [Databricks|https://docs.databricks.com/en/sql/language-manual/functions/elt.html]
> *
> [MySQL|https://dev.mysql.com/doc/refman/8.4/en/string-functions.html#function_elt]
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