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https://issues.apache.org/jira/browse/HIVE-2068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13017092#comment-13017092
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jirapos...@reviews.apache.org commented on HIVE-2068:
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https://reviews.apache.org/r/540/
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Review request for hive and namit jain.
Summary
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For HIVE-2068
This addresses bug HIVE-2068.
https://issues.apache.org/jira/browse/HIVE-2068
Diffs
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trunk/cli/src/java/org/apache/hadoop/hive/cli/CliDriver.java 1086466
trunk/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java 1086466
trunk/conf/hive-default.xml 1086466
trunk/hwi/src/java/org/apache/hadoop/hive/hwi/HWISessionItem.java 1086466
trunk/ql/src/java/org/apache/hadoop/hive/ql/CommandNeedRetryException.java
PRE-CREATION
trunk/ql/src/java/org/apache/hadoop/hive/ql/Context.java 1086466
trunk/ql/src/java/org/apache/hadoop/hive/ql/Driver.java 1086466
trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/FetchTask.java 1086466
trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/LimitOperator.java 1086466
trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/Task.java 1086466
trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/GenMapRedUtils.java
1086466
trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/SamplePruner.java
1086466
trunk/ql/src/java/org/apache/hadoop/hive/ql/parse/DDLSemanticAnalyzer.java
1086466
trunk/ql/src/java/org/apache/hadoop/hive/ql/parse/ParseContext.java 1086466
trunk/ql/src/java/org/apache/hadoop/hive/ql/parse/QBParseInfo.java 1086466
trunk/ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java
1086466
trunk/ql/src/java/org/apache/hadoop/hive/ql/plan/FetchWork.java 1086466
trunk/ql/src/java/org/apache/hadoop/hive/ql/plan/LimitDesc.java 1086466
trunk/ql/src/java/org/apache/hadoop/hive/ql/processors/CommandProcessor.java
1086466
trunk/ql/src/test/org/apache/hadoop/hive/ql/QTestUtil.java 1086466
trunk/ql/src/test/queries/clientpositive/global_limit.q PRE-CREATION
trunk/ql/src/test/results/clientpositive/global_limit.q.out PRE-CREATION
trunk/service/src/java/org/apache/hadoop/hive/service/HiveServer.java 1086466
Diff: https://reviews.apache.org/r/540/diff
Testing
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added a test to test suite.
Thanks,
Siying
> Speed up query "select xx,xx from xxx LIMIT xxx" if no filtering or
> aggregation
> -------------------------------------------------------------------------------
>
> Key: HIVE-2068
> URL: https://issues.apache.org/jira/browse/HIVE-2068
> Project: Hive
> Issue Type: Improvement
> Reporter: Siying Dong
> Assignee: Siying Dong
> Attachments: HIVE-2068.1.patch, HIVE-2068.2.patch, HIVE-2068.3.patch,
> HIVE-2068.4.patch
>
>
> Currently, "select xx,xx from xxx where ...(only partition conditions) LIMIT
> xxx" will start a MapReduce job with input to be the whole table or
> partition. The latency can be huge if the table or partition is big. We could
> reduce number of input files to speed up the queries.
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