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From "Ping Lu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-13228) when set hive.auto.convert.join and hive.optimize.skewjoin to true, the SELECT query which contains 3-way join is not properly executed
Date Tue, 08 Mar 2016 09:27:40 GMT

     [ https://issues.apache.org/jira/browse/HIVE-13228?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ping Lu updated HIVE-13228:
---------------------------
    Attachment: explain3.txt
                explain2.txt
                execution3.txt
                execution2.txt

> when set hive.auto.convert.join and hive.optimize.skewjoin to true, the SELECT query
which contains 3-way join is not properly executed
> ---------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-13228
>                 URL: https://issues.apache.org/jira/browse/HIVE-13228
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 0.13.1, 2.0.0
>         Environment: Hadoop2.4.0 Hive0.13.1/2.0.0
>            Reporter: Ping Lu
>            Assignee: Ping Lu
>         Attachments: execution2.txt, execution3.txt, explain2.txt, explain3.txt
>
>
> when set hive.auto.convert.join and hive.optimize.skewjoin to true, the SELECT query
which contains 3-way join(like the following Query1) is not properly executed. According to
hive execution logs, the query ran finished without any errors, but didn’t return any results.
If I set hive.optimize.skewjoin to false, or set hive.auto.convert.join to false and  hive.optimize.skewjoin
to true, the SELECT query can both execute properly and return correct results. 
> Steps to reproduce
> Prepare: 
> create three test tables and load data 
> 	create table test1(col1 string,col2 string) row format delimited fields terminated by
"\t";
> 	create table test2(col1 string,col2 string) row format delimited fields terminated by
"\t";
> 	create table test3(col1 string,col2 string) row format delimited fields terminated by
"\t";
> 	load data local inpath "test1" into table test1;  //11870882 rows
> 	load data local inpath "test2" into table test2;  //11870882 rows
> 	load data local inpath "test3" into table test3;  //11870882 rows
> Query1: SELECT query got wrong result
> 	set hive.optimize.skewjoin = true;
> 	set hive.auto.convert.join = true;
> select
> 		t1.col1
> 	from
> 		test1 t1
> 	join
> 		test2 t2
> 	on t1.col1 = t2.col1
> 	join
> 		test3 t3
> 	on t1.col2 = t3.col1
> 	;
> Query2: SELECT query got correct result
> 	set hive.optimize.skewjoin = false;
> 	set hive.auto.convert.join = true;
> select
> 		t1.col1
> 	from
> 		test1 t1
> 	join
> 		test2 t2
> 	on t1.col1 = t2.col1
> 	join
> 		test3 t3
> 	on t1.col2 = t3.col1
> 	;
> the execute plan for Query1 names explain1.txt .
> the hive execution logs for Query1: SELECT statement names execution1.txt .
> the execute plan for the Query2 names explain2.txt .
> the hive execution logs for Query2 names execution2.txt .



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