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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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