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_r205932661
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File path: docs/dev/table/sql.md
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@@ -1850,6 +1860,17 @@ FROM_BASE64(text string)
</td>
</tr>
+ <tr>
+ <td>
+ {% highlight text %}
+CHR(ascii integer)
+{% 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>CHR(65)</code> returns <code>A</code>, <code>CHR(97)</code> returns
<code>a</code>.</p>
Review comment:
1. Returns string contains a character which converts from a ASCII integer.
=> Returns the character corresponding to the input ASCII integer.
2. If the ASCII => If the ASCII code
3. return null. => returns null.
4. returns <code>a</code> => returns <code>'a'</code>
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