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https://issues.apache.org/jira/browse/FLINK-3140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15068586#comment-15068586
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ASF GitHub Bot commented on FLINK-3140:
---------------------------------------

Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1465#discussion_r48288039
  
    --- Diff: 
flink-core/src/main/java/org/apache/flink/api/common/typeutils/base/BasicTypeComparator.java
 ---
    @@ -42,6 +42,10 @@ protected BasicTypeComparator(boolean ascending) {
                this.ascendingComparison = ascending;
        }
     
    +   public boolean isAscendingComparison() {
    --- End diff --
    
    There is no need to touch this class, if you overwrite the 
`createComparator` method in the `RowTypeInfo` (details below).


> NULL value data layout in Row Serializer/Comparator
> ---------------------------------------------------
>
>                 Key: FLINK-3140
>                 URL: https://issues.apache.org/jira/browse/FLINK-3140
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table API
>            Reporter: Chengxiang Li
>            Assignee: Timo Walther
>
> To store/materialize NULL value in Row objects, we should need new Row 
> Serializer/Comparator which is aware of NULL value fields.



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