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Date: Mon, 14 Nov 2011 07:18:52 +0000 (UTC)
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Subject: [jira] [Updated] (HIVE-2566) reduce the number map-reduce jobs for
 union all
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     [ https://issues.apache.org/jira/browse/HIVE-2566?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Phabricator updated HIVE-2566:
------------------------------

    Attachment: HIVE-2566.D405.2.patch

njain updated the revision "HIVE-2566 [jira] reduce the number map-reduce jobs for union all".
Reviewers: JIRA

  HIVE-2566 patch available

REVISION DETAIL
  https://reviews.facebook.net/D405

AFFECTED FILES
  ql/src/test/results/clientpositive/merge4.q.out
  ql/src/test/results/clientpositive/auto_join27.q.out
  ql/src/test/results/clientpositive/union19.q.out
  ql/src/test/results/clientpositive/union4.q.out
  ql/src/test/results/clientpositive/union14.q.out
  ql/src/test/results/clientpositive/create_view.q.out
  ql/src/test/results/clientpositive/union5.q.out
  ql/src/test/results/clientpositive/ql_rewrite_gbtoidx.q.out
  ql/src/test/results/clientpositive/load_dyn_part14.q.out
  ql/src/test/results/clientpositive/union15.q.out
  ql/src/test/results/clientpositive/union24.q.out
  ql/src/test/results/clientpositive/union10.q.out
  ql/src/test/results/clientpositive/input25.q.out
  ql/src/test/results/clientpositive/union6.q.out
  ql/src/test/results/clientpositive/lineage1.q.out
  ql/src/test/results/clientpositive/union11.q.out
  ql/src/test/results/clientpositive/join35.q.out
  ql/src/test/results/clientpositive/union20.q.out
  ql/src/test/results/clientpositive/input26.q.out
  ql/src/test/results/clientpositive/union7.q.out
  ql/src/test/results/clientpositive/union17.q.out
  ql/src/test/results/clientpositive/union12.q.out
  ql/src/test/results/clientpositive/stats1.q.out
  ql/src/test/results/clientpositive/union18.q.out
  ql/src/test/results/clientpositive/union3.q.out
  ql/src/test/results/clientpositive/ppd_union_view.q.out
  ql/src/test/queries/clientpositive/union24.q
  ql/src/java/org/apache/hadoop/hive/ql/optimizer/GenMRProcContext.java
  ql/src/java/org/apache/hadoop/hive/ql/optimizer/GenMRUnion1.java
  ql/src/java/org/apache/hadoop/hive/ql/optimizer/GenMapRedUtils.java
  ql/src/java/org/apache/hadoop/hive/ql/exec/Operator.java

                
> reduce the number map-reduce jobs for union all
> -----------------------------------------------
>
>                 Key: HIVE-2566
>                 URL: https://issues.apache.org/jira/browse/HIVE-2566
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Namit Jain
>            Assignee: Namit Jain
>         Attachments: HIVE-2566.D405.1.patch, HIVE-2566.D405.2.patch
>
>
> A query like:
> select s.key, s.value from (
>   select key, value from src2  where key < 10
>   union all 
>   select key, value from src3  where key < 10
>   union all 
>   select key, value from src4  where key < 10
>   union all 
>   select key, count(1) as value from src5 group by key
> )s;
> should run the last sub-query 
> 'select key, count(1) as value from src5 group by key'
> as a map-reduce job.
> And then the union should be a map-only job reading from the first 3 map-only subqueries
> and the output of the last map-reduce job.
> The current plan is very inefficient.

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