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[jira] [Created] (FLINK-9853) add hex support in table api and sql


xueyu created FLINK-9853:
----------------------------

             Summary: add hex support in table api and sql
                 Key: FLINK-9853
                 URL: https://issues.apache.org/jira/browse/FLINK-9853
             Project: Flink
          Issue Type: Improvement
          Components: Table API & SQL
            Reporter: xueyu


like in mysql, HEX could take int or string arguments, For a integer argument N, it returns a hexadecimal string representation of the value of N. For a string argument str, it returns a hexadecimal string representation of str where each byte of each character in str is converted to two hexadecimal digits. 

Syntax:

HEX(100) = 64

HEX('This is a test String.') = '546869732069732061207465737420537472696e672e'

See more: [link MySQL|https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_hex]



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