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https://issues.apache.org/jira/browse/PHOENIX-3005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15338805#comment-15338805
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Lars Hofhansl commented on PHOENIX-3005:
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In the debugger I see that we happen to detect to that this is an ungrouped
aggregate, so in GroupBy.compile(...) we return UNGROUPED_GROUP_BY (which is
order preserving). The order preserving tracker definitely returns false, and
it is called only once.
In your test:
{{assertTrue(plan.getGroupBy().isOrderPreserving());}} passes even when
{{conn.createStatement().execute("CREATE INDEX idx ON t(v1)");}} is commented
out.
> Use DistinctPrefixFilter for 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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