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Posted to dev@hive.apache.org by "Namit Jain (JIRA)" <ji...@apache.org> on 2011/04/05 01:41:05 UTC

[jira] [Updated] (HIVE-2068) Speed up query "select xx,xx from xxx LIMIT xxx" if no filtering or aggregation

     [ https://issues.apache.org/jira/browse/HIVE-2068?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Namit Jain updated HIVE-2068:
-----------------------------

    Status: Patch Available  (was: Open)

> 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
>
>
> 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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