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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-6925) Add CONCAT/CONCAT_WS supported in SQL
Date Mon, 26 Jun 2017 08:00:04 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16062644#comment-16062644
] 

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

Github user twalthr commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4138#discussion_r123944651
  
    --- Diff: docs/dev/table/sql.md ---
    @@ -1573,6 +1573,29 @@ INITCAP(string)
           </td>
         </tr>
     
    +    <tr>
    +      <td>
    +        {% highlight text %}
    +CONCAT(string1, string2,...)
    +{% endhighlight %}
    +      </td>
    +      <td>
    +        <p>Returns the string that results from concatenating the arguments. Returns
NULL if any argument is NULL.</p>
    --- End diff --
    
    Can you add a little example? `E.g. CONCAT('a', 'b', 'c') returns 'XXX'.`


> 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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