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https://issues.apache.org/jira/browse/FLINK-6925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16062643#comment-16062643
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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_r123945022
--- 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>
+ </td>
+ </tr>
+
+ <tr>
+ <td>
+ {% highlight text %}
+CONCAT_WS(separator, string1, string2,...)
+{% endhighlight %}
+ </td>
+ <td>
+ <p>Returns the string that results from concatenating the
arguments and separator. The separator is added between the strings to be
concatenated. Returns NULL If the separator is NULL.</p>
--- End diff --
Replace `and` with `using a`. Can you add a little example here as well?
> 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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