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From "Damien Carol (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-11531) Add mysql-style LIMIT support to Hive, or improve ROW_NUMBER performance-wise
Date Sat, 28 Nov 2015 10:19:10 GMT

     [ https://issues.apache.org/jira/browse/HIVE-11531?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Damien Carol updated HIVE-11531:
--------------------------------
    Component/s: CBO

> Add mysql-style LIMIT support to Hive, or improve ROW_NUMBER performance-wise
> -----------------------------------------------------------------------------
>
>                 Key: HIVE-11531
>                 URL: https://issues.apache.org/jira/browse/HIVE-11531
>             Project: Hive
>          Issue Type: Improvement
>          Components: CBO
>            Reporter: Sergey Shelukhin
>            Assignee: Hui Zheng
>         Attachments: HIVE-11531.02.patch, HIVE-11531.WIP.1.patch, HIVE-11531.WIP.2.patch,
HIVE-11531.patch
>
>
> For any UIs that involve pagination, it is useful to issue queries in the form SELECT
... LIMIT X,Y where X,Y are coordinates inside the result to be paginated (which can be extremely
large by itself). At present, ROW_NUMBER can be used to achieve this effect, but optimizations
for LIMIT such as TopN in ReduceSink do not apply to ROW_NUMBER. We can add first class support
for "skip" to existing limit, or improve ROW_NUMBER for better performance



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