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https://issues.apache.org/jira/browse/PHOENIX-3005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15338825#comment-15338825
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James Taylor commented on PHOENIX-3005:
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You may have already discovered, but it looks like the node rewrite that
transforms the data table query into an index table query is losing the class
of functions. ParseNodeRewrite ends up creating an AggregateFunctionParseNode
instead of a DistinctCountParseNode, so you instanceof check is failing. Let me
see if there's an easy fix.
> 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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