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https://issues.apache.org/jira/browse/HIVE-13228?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ping Lu updated HIVE-13228:
---------------------------
Attachment: (was: 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: 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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