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Posted to dev@hive.apache.org by "Paul Butler (JIRA)" <ji...@apache.org> on 2010/12/03 00:54:12 UTC

[jira] Updated: (HIVE-1648) Automatically gathering stats when reading a table/partition

     [ https://issues.apache.org/jira/browse/HIVE-1648?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paul Butler updated HIVE-1648:
------------------------------

    Attachment: HIVE-1648.4.patch

> Automatically gathering stats when reading a table/partition
> ------------------------------------------------------------
>
>                 Key: HIVE-1648
>                 URL: https://issues.apache.org/jira/browse/HIVE-1648
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Ning Zhang
>            Assignee: Paul Butler
>         Attachments: HIVE-1648.2.patch, HIVE-1648.3.patch, HIVE-1648.4.patch, HIVE-1648.patch
>
>
> HIVE-1361 introduces a new command 'ANALYZE TABLE T COMPUTE STATISTICS' to gathering stats. This requires additional scan of the data. Stats gathering can be piggy-backed on TableScanOperator whenever a table/partition is scanned (given not LIMIT operator). 

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