phoenix-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-3773) Implement FIRST_VALUES aggregate function
Date Tue, 06 Jun 2017 16:16:18 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-3773?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16039190#comment-16039190
] 

James Taylor commented on PHOENIX-3773:
---------------------------------------

If you ran the tests locally, that's ok too. Would you mind attaching patches here for other
branches if this one doesn't apply cleanly?

> Implement FIRST_VALUES aggregate function
> -----------------------------------------
>
>                 Key: PHOENIX-3773
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-3773
>             Project: Phoenix
>          Issue Type: New Feature
>            Reporter: James Taylor
>            Assignee: Loknath Priyatham Teja Singamsetty 
>              Labels: SFDC
>             Fix For: 4.11.0
>
>         Attachments: PHOENIX-3773_4.x-HBase-0.98_final.patch, PHOENIX-3773_4.x-HBase-0.98.patch,
PHOENIX-3773_master_final.patch, PHOENIX-3773_master.patch, PHOENIX-3773.patch, PHOENIX-3773.v2.patch,
PHOENIX-3773.v3.patch
>
>
> Similar to FIRST_VALUE, but would allow the user to specify how many values to keep.
This could use a MinMaxPriorityQueue under the covers and be much more efficient than using
multiple NTH_VALUE calls to do the same like this:
> {code}
> SELECT entity_id,
>        NTH_VALUE(user_id,1) WITHIN GROUP (ORDER BY last_read_date DESC) as nth1_user_id,
>        NTH_VALUE(user_id,2) WITHIN GROUP (ORDER BY last_read_date DESC) as nth2_user_id,
>        NTH_VALUE(user_id,3) WITHIN GROUP (ORDER BY last_read_date DESC) as nth3_user_id,
>        count(*)
> FROM  MY_TABLE 
> WHERE tenant_id='00Dx0000000XXXX'
> AND entity_id in ('0D5x000000ABCD','0D5x000000ABCE')
> GROUP BY entity_id;
> {code}



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)

Mime
View raw message