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https://issues.apache.org/jira/browse/FLINK-9999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16580627#comment-16580627
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vinoyang commented on FLINK-9999:
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[~walterddr] I don't know if this is the SQL standard Scalar function, but
there are databases that provide this function. I don't know if the functions
in Flink Table/SQL are all SQL standard functions. It seems that some are not,
such as "similar to". Where can I see which standard functions are there? I
think it's reasonable to add some very common functions, I am going to try to
make this function support more types. [~twalthr]
> 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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