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https://issues.apache.org/jira/browse/PHOENIX-3390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16056669#comment-16056669
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Swapna Kasula commented on PHOENIX-3390:
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[~aertoria] I have pushed my code to git repo. Below is the URL, check it out.
https://github.com/SwapnaKasula/apache_phoenix_cdh5
> 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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