[jira] [Updated] (PHOENIX-3195) Slight safety improvement for using DistinctPrefixFilter

["Lars Hofhansl (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PHOENIX-3195?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars Hofhansl updated PHOENIX-3195:
-----------------------------------
    Attachment: 3195.txt

Trivial patch. Tested that it still performs the optimization if possible.

> 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
>            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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