[jira] [Created] (FLINK-6925) Add CONCAT/CONCAT_WS supported in SQL

[Shang Yuanchun (Jira)]

sunjincheng created FLINK-6925:
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             Summary: Add CONCAT/CONCAT_WS supported in SQL
                 Key: FLINK-6925
                 URL: https://issues.apache.org/jira/browse/FLINK-6925
             Project: Flink
          Issue Type: Sub-task
          Components: Table API & SQL
    Affects Versions: 1.4.0
            Reporter: sunjincheng


CONCAT(str1,str2,...)Returns the string that results from concatenating the arguments. May have one or more arguments. If all arguments are nonbinary strings, the result is a nonbinary string. If the arguments include any binary strings, the result is a binary string. A numeric argument is converted to its equivalent nonbinary string form.

CONCAT() returns NULL if any argument is NULL.

* Syntax:
CONCAT(str1,str2,...)

* Arguments
** str1,str2,... -

* Return Types
  string

* Example:
  CONCAT('F', 'lin', 'k') -> 'Flink'
  CONCAT('M', NULL, 'L') -> NULL
  CONCAT(14.3) -> '14.3'

* See more:
** [MySQL| https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_concat]


CONCAT_WS() stands for Concatenate With Separator and is a special form of CONCAT(). The first argument is the separator for the rest of the arguments. The separator is added between the strings to be concatenated. The separator can be a string, as can the rest of the arguments. If the separator is NULL, the result is NULL.

* Syntax:
CONCAT_WS(separator,str1,str2,...)

* Arguments
** separator -
** str1,str2,... -

* Return Types
  string

* Example:
  CONCAT_WS(',','First name','Second name','Last Name') -> 'First name,Second name,Last Name'

* See more:
** [MySQL| https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_concat-ws]



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