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From "Mehant Baid (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-2438) Query on views with Avg on integer column returns wrong result
Date Wed, 25 Mar 2015 18:17:53 GMT

     [ https://issues.apache.org/jira/browse/DRILL-2438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mehant Baid updated DRILL-2438:
-------------------------------
    Attachment: DRILL-2438.patch

[~amansinha100] can you please review.

> Query on views with Avg on integer column returns wrong result
> --------------------------------------------------------------
>
>                 Key: DRILL-2438
>                 URL: https://issues.apache.org/jira/browse/DRILL-2438
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Query Planning & Optimization
>    Affects Versions: 0.8.0
>            Reporter: Abhishek Girish
>            Assignee: Mehant Baid
>            Priority: Critical
>             Fix For: 0.9.0
>
>         Attachments: DRILL-2438.patch
>
>
> Git.Commit.ID: b3bdc27 (Mar 10)
> Average on an integer column returns an (inaccurate) integer value, instead of an (accurate)
decimal value. 
> *The following query returns wrong results:*
> {code:sql}
> > SELECT i_item_id, avg(i_manufact_id) agg1
> . . . . . . . . . . . . . . . . . > FROM item
> . . . . . . . . . . . . . . . . . > GROUP  BY i_item_id 
> . . . . . . . . . . . . . . . . . > ORDER  BY i_item_id
> . . . . . . . . . . . . . . . . . > LIMIT 5; 
> +------------+------------+
> | i_item_id  |    agg1    |
> +------------+------------+
> | AAAAAAAAAAABAAAA | 152        |
> | AAAAAAAAAAACAAAA | 187        |
> | AAAAAAAAAAAEAAAA | 251        |
> | AAAAAAAAAABAAAAA | 199        |
> | AAAAAAAAAABBAAAA | 636        |
> +------------+------------+
> 5 rows selected (0.324 seconds)
> {code}
> *Postgres results:*
> {code:sql}
> # SELECT i_item_id, avg(i_manufact_id) agg1
> tpcds1_new-# FROM item
> tpcds1_new-# GROUP  BY i_item_id 
> tpcds1_new-# ORDER  BY i_item_id
> tpcds1_new-# LIMIT 5; 
>     i_item_id     |         agg1         
> ------------------+----------------------
>  AAAAAAAAAAABAAAA | 152.3333333333333333
>  AAAAAAAAAAACAAAA | 373.0000000000000000
>  AAAAAAAAAAAEAAAA | 251.0000000000000000
>  AAAAAAAAAABAAAAA | 198.6666666666666667
>  AAAAAAAAAABBAAAA | 636.0000000000000000
> (5 rows)
> {code}



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