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

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-6925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16073879#comment-16073879 ] 

ASF GitHub Bot commented on FLINK-6925:
---------------------------------------

Github user sunjincheng121 commented on the issue:

    https://github.com/apache/flink/pull/4138
  
    Thanks @wuchong ! From my point of view +1 to merge.
    @twalthr do you have any other comments? :)


> 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
>            Assignee: 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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