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From "Robert Stupp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4914) Aggregation functions in CQL
Date Sun, 28 Sep 2014 10:57:36 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14151074#comment-14151074
] 

Robert Stupp commented on CASSANDRA-4914:
-----------------------------------------

bq. aggregate functions do only return their input type ...

Hm - I still think that we should be able to handle integer overflows - if for example people
get a negative result if summing just positive values, they'll complain about it.
Postgres for example [returns a bigint for int sums|http://www.postgresql.org/docs/9.1/static/functions-aggregate.html]
- Oracle doesn't have any integer data type in tables (only that NUMBER data type).
(But if that input-type==output-type behavior is clearly documented and people are able to
do e.g. a {{SELECT sum( (varint) myIntCol ) FROM ...}} then that's fine for me - but I'm not
sold on this.)

> Aggregation functions in CQL
> ----------------------------
>
>                 Key: CASSANDRA-4914
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4914
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Vijay
>            Assignee: Benjamin Lerer
>              Labels: cql, docs
>             Fix For: 3.0
>
>         Attachments: CASSANDRA-4914-V2.txt, CASSANDRA-4914-V3.txt, CASSANDRA-4914-V4.txt,
CASSANDRA-4914.txt
>
>
> The requirement is to do aggregation of data in Cassandra (Wide row of column values
of int, double, float etc).
> With some basic agree gate functions like AVG, SUM, Mean, Min, Max, etc (for the columns
within a row).
> Example:
> SELECT * FROM emp WHERE empID IN (130) ORDER BY deptID DESC;                        
           
>  empid | deptid | first_name | last_name | salary
> -------+--------+------------+-----------+--------
>    130 |      3 |     joe    |     doe   |   10.1
>    130 |      2 |     joe    |     doe   |    100
>    130 |      1 |     joe    |     doe   |  1e+03
>  
> SELECT sum(salary), empid FROM emp WHERE empID IN (130);                            
       
>  sum(salary) | empid
> -------------+--------
>    1110.1    |  130



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