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https://issues.apache.org/jira/browse/FLINK-9999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16623770#comment-16623770
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Dawid Wysakowicz commented on FLINK-9999:
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I would be against adding this function. It is not part of SQL 2016 standard
and even in the only RDBMS that provides this function it is discouraged to
use. Therefore I would vote for closing this issue and PR.
> 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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