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From "Ethan Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-3390) Custom UDAF for HyperLogLogPlus
Date Mon, 31 Jul 2017 06:10:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-3390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16106844#comment-16106844
] 

Ethan Wang commented on PHOENIX-3390:
-------------------------------------

Marking this ticket duplicate with PHOENIX-418.

For "Supporting approximate COUNT DISTINCT", let us continue the implementation updates(and
discussions) there at PHOENIX-418.

For another feature which is to expose the raw hyperLogLog hash binary directly to the user,
that will continue on this ticket.

> 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
>            Assignee: Ethan Wang
>            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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