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https://issues.apache.org/jira/browse/FLINK-9970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16559100#comment-16559100
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ASF GitHub Bot commented on FLINK-9970:
---------------------------------------

TisonKun commented on a change in pull request #6432: [FLINK-9970] Add ASCII 
function for table/sql API
URL: https://github.com/apache/flink/pull/6432#discussion_r205643221
 
 

 ##########
 File path: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/functions/ScalarFunctions.scala
 ##########
 @@ -196,6 +196,19 @@ object ScalarFunctions {
     new String(data)
   }
 
+  /**
+    * Returns the numeric value of the leftmost character of the string str.
+    * Returns 0 if str is the empty string. Returns NULL if str is NULL.
+    */
+  def ascii(str: String): String = {
+    if (str == null)
 
 Review comment:
   checkstyle would complain about no braces here, i.e. `if (...) { ... }`, 
also below

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> Add ASCII 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
>
> refer to : 
> https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_ascii



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