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https://issues.apache.org/jira/browse/PHOENIX-3005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15338392#comment-15338392
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Lars Hofhansl commented on PHOENIX-3005:
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Seems in the GroupByCompiler we still see T as the table to scan (rather than
T_idx).
> 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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