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Posted to dev@hive.apache.org by "Carl Steinbach (Updated) (JIRA)" <ji...@apache.org> on 2012/02/02 23:38:58 UTC
[jira] [Updated] (HIVE-1648) Automatically gathering statistics
when reading a table/partition
[ https://issues.apache.org/jira/browse/HIVE-1648?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Carl Steinbach updated HIVE-1648:
---------------------------------
Component/s: Statistics
Summary: Automatically gathering statistics when reading a table/partition (was: Automatically gathering stats when reading a table/partition)
> Automatically gathering statistics when reading a table/partition
> -----------------------------------------------------------------
>
> Key: HIVE-1648
> URL: https://issues.apache.org/jira/browse/HIVE-1648
> Project: Hive
> Issue Type: Sub-task
> Components: Statistics
> Reporter: Ning Zhang
> Assignee: Paul Butler
> Attachments: HIVE-1648.2.patch, HIVE-1648.3.patch, HIVE-1648.4.patch, HIVE-1648.5.patch, HIVE-1648.patch, hive-1648.svn.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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