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Posted to dev@hive.apache.org by "Ning Zhang (JIRA)" <ji...@apache.org> on 2010/09/17 00:30:33 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 ]

Ning Zhang updated HIVE-1648:
-----------------------------

        Parent: HIVE-33
    Issue Type: Sub-task  (was: New Feature)

> Automatically gathering stats when reading a table/partition
> ------------------------------------------------------------
>
>                 Key: HIVE-1648
>                 URL: https://issues.apache.org/jira/browse/HIVE-1648
>             Project: Hadoop Hive
>          Issue Type: Sub-task
>            Reporter: Ning Zhang
>
> 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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