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From "Ning Zhang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-1361) table/partition level statistics
Date Thu, 23 Sep 2010 01:04:33 GMT

     [ https://issues.apache.org/jira/browse/HIVE-1361?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ning Zhang updated HIVE-1361:
-----------------------------

    Attachment: HIVE-1361.4.java_only.patch
                HIVE-1361.4.patch

Uploading new patch that refreshed to the latest trunk. Also added a negative test case analyze.q
and some trivial clean up in Java code (removing commented out contents). 

> table/partition level statistics
> --------------------------------
>
>                 Key: HIVE-1361
>                 URL: https://issues.apache.org/jira/browse/HIVE-1361
>             Project: Hadoop Hive
>          Issue Type: Sub-task
>          Components: Query Processor
>            Reporter: Ning Zhang
>            Assignee: Ahmed M Aly
>             Fix For: 0.7.0
>
>         Attachments: HIVE-1361.2.patch, HIVE-1361.2_java_only.patch, HIVE-1361.3.patch,
HIVE-1361.4.java_only.patch, HIVE-1361.4.patch, HIVE-1361.java_only.patch, HIVE-1361.patch,
stats0.patch
>
>
> 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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