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https://issues.apache.org/jira/browse/FLINK-9970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16560607#comment-16560607
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ASF GitHub Bot commented on FLINK-9970:
---------------------------------------
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
##########
File path: docs/dev/table/sql.md
##########
@@ -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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> Add ASCII/CHR function for table/sql API
> ----------------------------------------
>
> Key: FLINK-9970
> URL: https://issues.apache.org/jira/browse/FLINK-9970
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Reporter: vinoyang
> Assignee: vinoyang
> Priority: Minor
> Labels: pull-request-available
>
> for ASCII function :
> refer to :
> [https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_ascii]
> for CHR function :
> This function convert ASCII code to a character,
> refer to : [https://doc.ispirer.com/sqlways/Output/SQLWays-1-071.html]
> Considering "CHAR" always is a keyword in many database, so we use "CHR"
> keyword.
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