hequn8128 commented on a change in pull request #6432: [FLINK-9970] Add
ASCII/CHR function for table/sql API
URL: https://github.com/apache/flink/pull/6432#discussion_r205932686
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File path: docs/dev/table/tableApi.md
##########
@@ -2507,6 +2518,17 @@ concat_ws(separator, string1, string2,...)
<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 %}
+INTEGER.chr()
+{% endhighlight %}
+ </td>
+ <td>
+ <p>Returns string contains a character which converts from a ASCII
integer. If the ASCII less then 0 or greater than 255, return null. E.g.
<code>97.chr()</code> returns <code>a</code></p>
Review comment:
1. return null. => returns null.
2. returns <code>a</code> => returns <code>'a'</code>
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