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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-12165) wrong result when hive.optimize.sampling.orderby=true with some aggregate functions
Date Tue, 05 Apr 2016 18:18:25 GMT

     [ https://issues.apache.org/jira/browse/HIVE-12165?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sergey Shelukhin updated HIVE-12165:
------------------------------------
    Fix Version/s: 2.0.1

> wrong result when hive.optimize.sampling.orderby=true with some aggregate functions
> -----------------------------------------------------------------------------------
>
>                 Key: HIVE-12165
>                 URL: https://issues.apache.org/jira/browse/HIVE-12165
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 2.1.0
>         Environment: hortonworks  2.3
>            Reporter: ErwanMAS
>            Assignee: Aihua Xu
>            Priority: Critical
>             Fix For: 2.1.0, 2.0.1
>
>         Attachments: HIVE-12165.patch
>
>
> This simple query give wrong result , when , i use the parallel order .
> {noformat}
> select count(*) , count(distinct dummyint ) , min(dummyint),max(dummyint) from foobar_1M
;
> {noformat}
> Current wrong result :
> {noformat}
> c0	c1	c2	c3
> 32740	32740	0	163695
> 113172	113172	163700	729555
> 54088	54088	729560	999995
> {noformat}
> Right result :
> {noformat}
> c0	c1	c2	c3
> 1000000	1000000	0	999999
> {noformat}
> The sql script for my test 
> {noformat}
> drop table foobar_1 ;
> create table foobar_1 ( dummyint int  , dummystr string ) ;
> insert into table foobar_1 select count(*),'dummy 0'  from foobar_1 ;
> drop table foobar_1M ;
> create table foobar_1M ( dummyint bigint  , dummystr string ) ;
> insert overwrite table foobar_1M
>        select val_int  , concat('dummy ',val_int) from
>              ( select ((((((d_1*10)+d_2)*10+d_3)*10+d_4)*10+d_5)*10+d_6) as val_int from
foobar_1
>                  lateral view outer explode(split("0,1,2,3,4,5,6,7,8,9",",")) tbl_1 as
d_1
>                  lateral view outer explode(split("0,1,2,3,4,5,6,7,8,9",",")) tbl_2 as
d_2
>                  lateral view outer explode(split("0,1,2,3,4,5,6,7,8,9",",")) tbl_3 as
d_3
>                  lateral view outer explode(split("0,1,2,3,4,5,6,7,8,9",",")) tbl_4 as
d_4
>                  lateral view outer explode(split("0,1,2,3,4,5,6,7,8,9",",")) tbl_5 as
d_5
>                  lateral view outer explode(split("0,1,2,3,4,5,6,7,8,9",",")) tbl_6 as
d_6  ) as f                 ;
> set hive.optimize.sampling.orderby.number=10000;
> set hive.optimize.sampling.orderby.percent=0.1f;
> set mapreduce.job.reduces=3 ;
> set hive.optimize.sampling.orderby=false;
> select count(*) , count(distinct dummyint ) , min(dummyint),max(dummyint) from foobar_1M
;
> set hive.optimize.sampling.orderby=true;
> select count(*) , count(distinct dummyint ) , min(dummyint),max(dummyint) from foobar_1M
;
> {noformat}



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