[ https://issues.apache.org/jira/browse/HIVE-3562?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Phabricator updated HIVE-3562: ------------------------------ Attachment: HIVE-3562.D5967.6.patch navis updated the revision "HIVE-3562 [jira] Some limit can be pushed down to map stage". Rebased to trunk Reviewers: tarball, JIRA REVISION DETAIL https://reviews.facebook.net/D5967 CHANGE SINCE LAST DIFF https://reviews.facebook.net/D5967?vs=32943&id=38379#toc AFFECTED FILES common/src/java/org/apache/hadoop/hive/conf/HiveConf.java conf/hive-default.xml.template ql/build.xml ql/ivy.xml ql/src/java/org/apache/hadoop/hive/ql/exec/ExtractOperator.java ql/src/java/org/apache/hadoop/hive/ql/exec/ForwardOperator.java ql/src/java/org/apache/hadoop/hive/ql/exec/GroupByOperator.java ql/src/java/org/apache/hadoop/hive/ql/exec/Operator.java ql/src/java/org/apache/hadoop/hive/ql/exec/ReduceSinkOperator.java ql/src/java/org/apache/hadoop/hive/ql/exec/SelectOperator.java ql/src/java/org/apache/hadoop/hive/ql/io/HiveKey.java ql/src/java/org/apache/hadoop/hive/ql/optimizer/LimitPushdownOptimizer.java ql/src/java/org/apache/hadoop/hive/ql/optimizer/Optimizer.java ql/src/java/org/apache/hadoop/hive/ql/plan/ReduceSinkDesc.java ql/src/test/queries/clientpositive/limit_pushdown.q ql/src/test/results/clientpositive/limit_pushdown.q.out To: JIRA, tarball, navis Cc: njain > 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 > 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 > > > 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 -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira