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https://issues.apache.org/jira/browse/PHOENIX-3390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15598645#comment-15598645
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James Taylor commented on PHOENIX-3390:
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The way I think this could be more generally exposed is through a new set of
approximate aggregate functions like APPROX_COUNT, APPROX_SUM, etc. You
wouldn't want to quote column names either - that wouldn't be very natural and
you'd lose the type checking ability that's important in SQL.
> Custom UDAF for HyperLogLogPlus
> -------------------------------
>
> Key: PHOENIX-3390
> URL: https://issues.apache.org/jira/browse/PHOENIX-3390
> Project: Phoenix
> Issue Type: New Feature
> Reporter: Swapna Kasula
> Priority: Minor
>
> With ref # PHOENIX-2069
> Custome UDAF to aggregate/union of Hyperloglog's of a column and returns a
> Hyperloglog.
> select hllUnion("col1") from table; //returns a Hyperloglog, which is the
> union of all hyperloglog's from all rows for column 'col1'
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