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Posted to dev@hive.apache.org by "Paul Butler (JIRA)" <ji...@apache.org> on 2010/12/03 00:56:11 UTC
[jira] Commented: (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:comment-tabpanel&focusedCommentId=12966354#action_12966354 ]
Paul Butler commented on HIVE-1648:
-----------------------------------
Changes made. Note that subqueries are not piggybacked, but tests are there to make sure they still run when hive.stats.autogather=true.
> 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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