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https://issues.apache.org/jira/browse/FLINK-6892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16319979#comment-16319979
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ASF GitHub Bot commented on FLINK-6892:
---------------------------------------
Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/4127#discussion_r160628359
--- Diff: docs/dev/table/sql.md ---
@@ -1744,6 +1743,29 @@ CONCAT_WS(separator, string1, string2,...)
</td>
<td>
<p>Returns the string that results from concatenating the
arguments using a separator. The separator is added between the strings to be
concatenated. Returns NULL If the separator is NULL. CONCAT_WS() does not skip
empty strings. However, it does skip any NULL argument. E.g.
<code>CONCAT_WS("~", "AA", "BB", "", "CC")</code> returns
<code>AA~BB~~CC</code></p>
+ </td>
+ </tr>
+
+ <tr>
+ <td>
+ {% highlight text %}
+LPAD(text string, len integer, pad string)
+{% endhighlight %}
+ </td>
+ <td>
+ <p>Returns the string text, left-padded with the string pad to a
length of len characters. If text is longer than len, the return value is
shortened to len characters.</p>
--- End diff --
Can you add two examples where the length is greater/smaller that the
string.
> Add L/RPAD supported in SQL
> ---------------------------
>
> Key: FLINK-6892
> URL: https://issues.apache.org/jira/browse/FLINK-6892
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Affects Versions: 1.4.0
> Reporter: sunjincheng
> Assignee: sunjincheng
>
> L/RPAD(str,len,padstr) Returns the string str, left/right-padded with the
> string padstr to a length of len characters. If str is longer than len, the
> return value is shortened to len characters.
> * Syntax:
> LPAD(str,len,padstr)
> * Arguments
> **str: -
> **len: -
> **padstr: -
> * Return Types
> String
> * Example:
> LPAD('hi',4,'??') -> '??hi'
> LPAD('hi',1,'??') -> 'h'
> RPAD('hi',4,'??') -> 'hi??'
> RPAD('hi',1,'??') -> 'h'
> * See more:
> ** [MySQL|
> https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_lpad]
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