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https://issues.apache.org/jira/browse/PHOENIX-4742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16480170#comment-16480170
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James Taylor commented on PHOENIX-4742:
---------------------------------------

Anyone got time for a code review: [~sergey.soldatov], [~rajeshbabu], 
[~tdsilva]?

> DistinctPrefixFilter potentially seeks to lesser key when descending or null 
> value
> ----------------------------------------------------------------------------------
>
>                 Key: PHOENIX-4742
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4742
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: James Taylor
>            Assignee: James Taylor
>            Priority: Major
>             Fix For: 4.14.0, 5.0.0
>
>         Attachments: PHOENIX-4742_v1.patch
>
>
> DistinctPrefixFilter seeks to a smaller key than the current key (which 
> causes an infinite loop in HBase 1.4 and seeks to every row in other HBase 
> versions). This happens when:
>  # Last column of distinct is descending. We currently always add a 0x01 
> byte, but since the separator byte if 0xFF when descending, the seek key is 
> too small.
>  # Last column value is null. In this case, instead of adding a 0x01 byte, we 
> need to increment in-place the null value of the last distinct column. 
> This was discovered due to 
> OrderByIT.testOrderByReverseOptimizationWithNUllsLastBug3491 hanging in 
> master.



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