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Date: Wed, 17 Dec 2014 23:17:13 +0000 (UTC)
From: "Xuefu Zhang (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12756590.1416443405000.50610.1418858233492@Atlassian.JIRA>
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 <JIRA.12756590.1416443405138@arcas>
Subject: [jira] [Assigned] (HIVE-8920) SplitSparkWorkResolver doesn't work
 with UnionWork [Spark Branch]
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     [ https://issues.apache.org/jira/browse/HIVE-8920?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xuefu Zhang reassigned HIVE-8920:
---------------------------------

    Assignee: Xuefu Zhang

> SplitSparkWorkResolver doesn't work with UnionWork [Spark Branch]
> -----------------------------------------------------------------
>
>                 Key: HIVE-8920
>                 URL: https://issues.apache.org/jira/browse/HIVE-8920
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>    Affects Versions: spark-branch
>            Reporter: Chao
>            Assignee: Xuefu Zhang
>
> The following query will not work:
> {code}
> from (select * from table0 union all select * from table1) s
> insert overwrite table table3 select s.x, count(1) group by s.x
> insert overwrite table table4 select s.y, count(1) group by s.y;
> {code}
> Currently, the plan for this query, before SplitSparkWorkResolver, looks like below:
> {noformat}
>    M1    M2
>      \  / \
>       U3   R5
>       |
>       R4
> {noformat}
> In {{SplitSparkWorkResolver#splitBaseWork}}, it assumes that the {{childWork}} is a ReduceWork, but for this case, you can see that for M2 the childWork could be UnionWork U3. Thus, the code will fail.


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