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From "Victoria Markman (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (DRILL-3254) Average over window functions returns wrong results
Date Mon, 29 Jun 2015 23:03:04 GMT

     [ https://issues.apache.org/jira/browse/DRILL-3254?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Victoria Markman closed DRILL-3254.
-----------------------------------

> Average over window functions returns wrong results
> ---------------------------------------------------
>
>                 Key: DRILL-3254
>                 URL: https://issues.apache.org/jira/browse/DRILL-3254
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Query Planning & Optimization
>    Affects Versions: 1.1.0
>            Reporter: Abhishek Girish
>            Assignee: Mehant Baid
>              Labels: window_function
>             Fix For: 1.1.0
>
>         Attachments: DRILL-3254.patch
>
>
> Average function on numeric column returns an (inaccurate) integer value, instead of
an (accurate) decimal (or floating point) value.
> *Results from Drill:*
> {code:sql}
> > select s_city, s_store_sk, avg(s_number_employees) over (PARTITION BY s_city ORDER
BY s_store_sk) from store limit 10;
> +-----------+-------------+---------+
> |  s_city   | s_store_sk  | EXPR$2  |
> +-----------+-------------+---------+
> | Fairview  | 5           | 288     |
> | Fairview  | 8           | 283     |
> | Fairview  | 12          | 286     |
> | Midway    | 1           | 245     |
> | Midway    | 2           | 240     |
> | Midway    | 3           | 239     |
> | Midway    | 4           | 233     |
> | Midway    | 6           | 232     |
> | Midway    | 7           | 243     |
> | Midway    | 9           | 247     |
> +-----------+-------------+---------+
> 10 rows selected (0.197 seconds)
> {code}
> *Results from Postgres:*
> {code:sql}
> # select s_city, s_store_sk, avg(s_number_employees) over (PARTITION BY s_city ORDER
BY s_store_sk) from store limit 10;
>   s_city  | s_store_sk |         avg          
> ----------+------------+----------------------
>  Fairview |          5 | 288.0000000000000000
>  Fairview |          8 | 283.0000000000000000
>  Fairview |         12 | 286.6666666666666667
>  Midway   |          1 | 245.0000000000000000
>  Midway   |          2 | 240.5000000000000000
>  Midway   |          3 | 239.0000000000000000
>  Midway   |          4 | 233.7500000000000000
>  Midway   |          6 | 232.8000000000000000
>  Midway   |          7 | 243.5000000000000000
>  Midway   |          9 | 247.4285714285714286
> (10 rows)
> {code}
> Drill returns right results without window functions:
> {code:sql}
> > select s_city, s_store_sk, avg(s_number_employees) from store group by s_city, s_store_sk
order by 1,2 limit 10;
> +-----------+-------------+---------+
> |  s_city   | s_store_sk  | EXPR$2  |
> +-----------+-------------+---------+
> | Fairview  | 5           | 288.0   |
> | Fairview  | 8           | 278.0   |
> | Fairview  | 12          | 294.0   |
> | Midway    | 1           | 245.0   |
> | Midway    | 2           | 236.0   |
> | Midway    | 3           | 236.0   |
> | Midway    | 4           | 218.0   |
> | Midway    | 6           | 229.0   |
> | Midway    | 7           | 297.0   |
> | Midway    | 9           | 271.0   |
> +-----------+-------------+---------+
> 10 rows selected (0.306 seconds)
> {code}



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