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From "Ning Zhang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1361) table/partition level statistics
Date Sat, 22 May 2010 03:00:17 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12870264#action_12870264
] 

Ning Zhang commented on HIVE-1361:
----------------------------------

all these stats should be able to collected automatically at insert time. since loading doesn't
scan the data, we cannot gather stats from this command. 

> table/partition level statistics
> --------------------------------
>
>                 Key: HIVE-1361
>                 URL: https://issues.apache.org/jira/browse/HIVE-1361
>             Project: Hadoop Hive
>          Issue Type: Sub-task
>    Affects Versions: 0.6.0
>            Reporter: Ning Zhang
>            Assignee: Ahmed M Aly
>             Fix For: 0.6.0
>
>
> At the first step, we gather table-level stats for non-partitioned table and partition-level
stats for partitioned table. Future work could extend the table level stats to partitioned
table as well. 
> There are 3 major milestones in this subtask: 
>  1) extend the insert statement to gather table/partition level stats on-the-fly.
>  2) extend metastore API to support storing and retrieving stats for a particular table/partition.

>  3) add an ANALYZE TABLE [PARTITION] statement in Hive QL to gather stats for existing
tables/partitions. 
> The proposed stats are:
> Partition-level stats: 
>   - number of rows
>   - total size in bytes
>   - number of files
>   - max, min, average row sizes
>   - max, min, average file sizes
> Table-level stats in addition to partition level stats:
>   - number of partitions

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