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https://issues.apache.org/jira/browse/PHOENIX-3390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16064282#comment-16064282
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Ethan Wang commented on PHOENIX-3390:
-------------------------------------
+1 for keeping syntax of PHOENIX-3390 and CALCITE-1588 similar.
Thanks [~julianhyde] for the info. It's very reasonable to have
{quote}COUNT(DISTINCT customerId) APPROXIMATE (WITHIN 10 PERCENT) {quote}
rather than a dedicated {quote}APPROX_COUNT(){quote}
Since the approximation argument should be per query, rather than per
projection.
Currently, it seems to me CALCITE-1588 has not started yet, it will be
reasonable for both PHOENIX-3390 and CALCITE-1588 to follow this purposed
design going forward.
> 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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