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https://issues.apache.org/jira/browse/HIVE-22198?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HIVE-22198 started by LuGuangMing.
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> Execute unoin-all with childs Join in parallel
> ----------------------------------------------
>
> Key: HIVE-22198
> URL: https://issues.apache.org/jira/browse/HIVE-22198
> Project: Hive
> Issue Type: Bug
> Affects Versions: 3.1.0
> Reporter: LuGuangMing
> Assignee: LuGuangMing
> Priority: Major
> Attachments: test-parallel.sql
>
>
> set parallel is true, set skewjoin is false, set auto convert join is false.
> run a unoin all, There is nothing error message, but some result data is
> missing, details check attatchment sql file
> create table tab1(tid int, com string) row format delimited fields terminated
> by '\t' stored as textfile;
> create table tab2(tid int, com string) row format delimited fields terminated
> by '\t' stored as textfile;
> create table tab3(tid int, com string) row format delimited fields terminated
> by '\t' stored as textfile;
> create table tab4(tid int, com string) row format delimited fields terminated
> by '\t' stored as textfile;
> insert into tab1 values(1,'abc'),(2,'bcd'),(3,'cde');
> insert into tab2 values(1,'abc'),(2,'bcd'),(3,'cde');
> insert into tab3 values(1,'abc'),(2,'bcd'),(3,'cde');
> insert into tab4 values(1,'abc'),(2,'bcd'),(3,'cde');
> set hive.auto.convert.join=false;
> set hive.optimize.skewjoin=true;
> set hive.exec.parallel=true;
> SELECT sum(1) as a
> FROM tab1 t1
> INNER JOIN tab2 t2
> ON t1.com = t2.com
> UNION ALL
> SELECT sum(1) as a
> FROM tab3 t3
> INNER JOIN tab4 t4
> ON t3.com = t4.com;
> -- result total number shoud be two result, but it's one
> create table test_parallel stored as orcfile as
> SELECT sum(1) as a
> FROM tab1 t1
> INNER JOIN tab2 t2
> ON t1.com = t2.com
> UNION ALL
> SELECT sum(1) as a
> FROM tab3 t3
> INNER JOIN tab4 t4
> ON t3.com = t4.com;
> select * from test_parallel;
>
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