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From "Paul Butler (JIRA)" <>
Subject [jira] Commented: (HIVE-1648) Automatically gathering stats when reading a table/partition
Date Thu, 02 Dec 2010 23:56:11 GMT


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:
>             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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