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https://issues.apache.org/jira/browse/FLINK-9999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16580197#comment-16580197
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Rong Rong commented on FLINK-9999:
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I do not have access to the newest SQL 2016 standard, but is {{IS_NUMERIC}} in
it? Seems like multiple DBMS utilizes it in different way. Some takes more than
just String/VARCHAR type as inputs.
> Add ISNUMERIC supported in Table API/SQL
> ----------------------------------------
>
> Key: FLINK-9999
> URL: https://issues.apache.org/jira/browse/FLINK-9999
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: vinoyang
> Assignee: vinoyang
> Priority: Major
> Labels: pull-request-available
>
> ISNUMERIC function used to verify a expression is a valid numberic type.
> documentation :
> https://docs.microsoft.com/en-us/sql/t-sql/functions/isnumeric-transact-sql?view=sql-server-2017
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