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[jira] [Created] (FLINK-9999) Add ISNUMERIC supported in Table API/SQL


vinoyang created FLINK-9999:
-------------------------------

             Summary: 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


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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