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https://issues.apache.org/jira/browse/HIVE-3562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13753365#comment-13753365
]
Hudson commented on HIVE-3562:
------------------------------
ABORTED: Integrated in Hive-trunk-hadoop2 #387 (See
[https://builds.apache.org/job/Hive-trunk-hadoop2/387/])
HIVE-3562 : Some limit can be pushed down to map stage (Navis via Ashutosh
Chauhan) (hashutosh:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1518234)
* /hive/trunk/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java
* /hive/trunk/conf/hive-default.xml.template
* /hive/trunk/ql/build.xml
* /hive/trunk/ql/ivy.xml
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/ExtractOperator.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/ForwardOperator.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/GroupByOperator.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/Operator.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/ReduceSinkOperator.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/SelectOperator.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/TopNHash.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/io/HiveKey.java
*
/hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/LimitPushdownOptimizer.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/Optimizer.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/plan/ReduceSinkDesc.java
* /hive/trunk/ql/src/test/queries/clientpositive/limit_pushdown.q
* /hive/trunk/ql/src/test/queries/clientpositive/limit_pushdown_negative.q
* /hive/trunk/ql/src/test/results/clientpositive/limit_pushdown.q.out
* /hive/trunk/ql/src/test/results/clientpositive/limit_pushdown_negative.q.out
> Some limit can be pushed down to map stage
> ------------------------------------------
>
> Key: HIVE-3562
> URL: https://issues.apache.org/jira/browse/HIVE-3562
> Project: Hive
> Issue Type: Bug
> Reporter: Navis
> Assignee: Navis
> Priority: Trivial
> Fix For: 0.12.0
>
> Attachments: HIVE-3562.D5967.1.patch, HIVE-3562.D5967.2.patch,
> HIVE-3562.D5967.3.patch, HIVE-3562.D5967.4.patch, HIVE-3562.D5967.5.patch,
> HIVE-3562.D5967.6.patch, HIVE-3562.D5967.7.patch, HIVE-3562.D5967.8.patch,
> HIVE-3562.D5967.9.patch
>
>
> Queries with limit clause (with reasonable number), for example
> {noformat}
> select * from src order by key limit 10;
> {noformat}
> makes operator tree,
> TS-SEL-RS-EXT-LIMIT-FS
> But LIMIT can be partially calculated in RS, reducing size of shuffling.
> TS-SEL-RS(TOP-N)-EXT-LIMIT-FS
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