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Date: Tue, 22 Jun 2010 19:22:54 -0400 (EDT)
From: "Ning Zhang (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Subject: [jira] Commented: (HIVE-1361) table/partition level statistics
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    [ https://issues.apache.org/jira/browse/HIVE-1361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12881448#action_12881448 ] 

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

Some comments from internal design review:
 - The ANALYZE TABLE command should be integrated with the data replication hook. When an existing table/partition is analyzed, a new WriteEntity should be generated to make metadata replication work. 
 - Investigate JDO on top of HBase integration. If JDO works on HBase, we could just use JDO to update column stats as well. 
 - ANALYZE TABLE partition (<partition_spec>) should support "dynamic-partition-style" partition specification. This means the if there are 2 partition columns ds, hr, we can do analyze table partition(ds = '2010-06-01', hr) to analyze all hr sub-partitions under ds='2010-06-01'. 


> 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
>
> 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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