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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-3005) Use DistinctPrefixFilter for COUNT(DISTINCT...) index scans
Date Sun, 19 Jun 2016 22:47:05 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-3005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15338830#comment-15338830
] 

Lars Hofhansl commented on PHOENIX-3005:
----------------------------------------

This is after I make this change in GroupBy.compile:
{code}
            if (isOrderPreserving || isUngroupedAggregate) {
                return new GroupBy.GroupByBuilder(this).setOrderPreservingColumnCount(orderPreservingColumnCount).build();
            }
{code}


> Use DistinctPrefixFilter for COUNT(DISTINCT...) index scans
> -----------------------------------------------------------
>
>                 Key: PHOENIX-3005
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-3005
>             Project: Phoenix
>          Issue Type: Sub-task
>            Reporter: Lars Hofhansl
>             Fix For: 4.8.0
>
>
> Currently the optimization in PHOENIX-258 is not used for DISTINCT index scans. We should
add that as well.



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