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https://issues.apache.org/jira/browse/PHOENIX-3195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15431310#comment-15431310
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Lars Hofhansl commented on PHOENIX-3195:
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I'm just going to commit this. Safe trivial change.
> Slight safety improvement for using DistinctPrefixFilter
> --------------------------------------------------------
>
> Key: PHOENIX-3195
> URL: https://issues.apache.org/jira/browse/PHOENIX-3195
> Project: Phoenix
> Issue Type: Sub-task
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Priority: Minor
> Fix For: 4.9.0, 4.8.1
>
> Attachments: 3195.txt
>
>
> There is a very slight improvement to when we should use the
> DistinctPrefixFilter in its current form.
> Currently we check for the absence of WhereConditions, but what we really
> mean to make sure that only one Cell per row is seen. Phoenix already does
> that and used the FirstKeyOnlyFilter in that case. It's best to use this
> condition as well, just to be absolutely safe.
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