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Navis commented on HIVE-3562: ----------------------------- I'm on vacation till next tuesday. Feel free to modify this patch, thanks. > 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, 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 -- 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