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From "ErwanMAS (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-12165) wrong result when hive.optimize.sampling.orderby=true with some aggregate functions
Date Tue, 13 Oct 2015 21:34:05 GMT
ErwanMAS created HIVE-12165:
-------------------------------

             Summary: 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
         Environment: hortonworks  2.3

            Reporter: ErwanMAS
            Priority: Critical


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_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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