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From "Deneche A. Hakim (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-3689) incorrect results : aggregate AVG returns wrong results over results returned by LEAD function.
Date Mon, 24 Aug 2015 15:38:46 GMT

     [ https://issues.apache.org/jira/browse/DRILL-3689?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Deneche A. Hakim updated DRILL-3689:
------------------------------------
    Assignee: Khurram Faraaz  (was: Deneche A. Hakim)

> incorrect results : aggregate AVG returns wrong results over results returned by LEAD
function.
> -----------------------------------------------------------------------------------------------
>
>                 Key: DRILL-3689
>                 URL: https://issues.apache.org/jira/browse/DRILL-3689
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Relational Operators
>    Affects Versions: 1.2.0
>         Environment:  private-branch https://github.com/adeneche/incubator-drill/tree/new-window-funcs
>            Reporter: Khurram Faraaz
>            Assignee: Khurram Faraaz
>            Priority: Critical
>              Labels: window_function
>             Fix For: 1.2.0
>
>
> Aggregate AVG returns wrong results over results returned by LEAD function.
> results returned by Drill
> {code}
> 0: jdbc:drill:schema=dfs.tmp> SELECT  avg(lead_col1) FROM (SELECT LEAD(col1) OVER(PARTITION
BY col7 ORDER BY col1) lead_col1 , col7 FROM FEWRWSPQQ_101) sub_query;
> +-------------------------+
> |         EXPR$0          |
> +-------------------------+
> | 2.35195986941647008E17  |
> +-------------------------+
> 1 row selected (0.264 seconds)
> {code}
> Explain plan for above query from Drill
> {code}
> 0: jdbc:drill:schema=dfs.tmp> explain plan for SELECT  avg(lead_col1) FROM (SELECT
LEAD(col1) OVER(PARTITION BY col7 ORDER BY col1) lead_col1 , col7 FROM FEWRWSPQQ_101) sub_query;
> +------+------+
> | text | json |
> +------+------+
> | 00-00    Screen
> 00-01      Project(EXPR$0=[$0])
> 00-02        Project(EXPR$0=[CAST(/(CastHigh(CASE(=($1, 0), null, $0)), $1)):ANY NOT
NULL])
> 00-03          StreamAgg(group=[{}], agg#0=[$SUM0($0)], agg#1=[COUNT($0)])
> 00-04            Project(w0$o0=[$3])
> 00-05              Window(window#0=[window(partition {2} order by [1] range between UNBOUNDED
PRECEDING and CURRENT ROW aggs [LEAD($1)])])
> 00-06                SelectionVectorRemover
> 00-07                  Sort(sort0=[$2], sort1=[$1], dir0=[ASC], dir1=[ASC])
> 00-08                    Project(T36¦¦*=[$0], col1=[$1], col7=[$2])
> 00-09                      Scan(groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath
[path=maprfs:///tmp/FEWRWSPQQ_101]], selectionRoot=maprfs:/tmp/FEWRWSPQQ_101, numFiles=1,
columns=[`*`]]])
> {code}
> results returned by Postgres
> {code}
> postgres=# SELECT  avg(lead_col1) FROM (SELECT LEAD(col1) OVER(PARTITION BY col7 ORDER
BY col1) lead_col1 , col7 FROM FEWRWSPQQ_101) sub_query;
>          avg         
> ---------------------
>  1157533190627124568
> (1 row)
> {code}



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