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From "Chao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-8920) SplitSparkWorkResolver doesn't work with UnionWork [Spark Branch]
Date Mon, 08 Dec 2014 19:53:13 GMT

    [ https://issues.apache.org/jira/browse/HIVE-8920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14238371#comment-14238371
] 

Chao commented on HIVE-8920:
----------------------------

In HIVE-9041, we aim to generate better operator plan for this case. Hopefully when it's resolved,
this JIRA will also be automatically resolved.

> 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
>
> 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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