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From "He Yongqiang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-352) Make Hive support column based storage
Date Wed, 29 Apr 2009 03:51:30 GMT

    [ https://issues.apache.org/jira/browse/HIVE-352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12703980#action_12703980
] 

He Yongqiang commented on HIVE-352:
-----------------------------------

Zheng, can you post your profiling results?
I did a test with PerformTestRCFileAndSeqFile, and it seems RCFile does better in both reading
and writing. Can you also does a test with PerformTestRCFileAndSeqFile? 
I am refactoring BytesRefArrayWritable today. BytesRefArrayWritable is a public class, and
oncethe number of BytesRefWritable it holds is changed, currently we have to recreate a new
list for that. And i am trying to avoid recreating a new list by able to narrow or enlarge
the underlying list. It needs more work than I initially thought.

> Make Hive support column based storage
> --------------------------------------
>
>                 Key: HIVE-352
>                 URL: https://issues.apache.org/jira/browse/HIVE-352
>             Project: Hadoop Hive
>          Issue Type: New Feature
>            Reporter: He Yongqiang
>            Assignee: He Yongqiang
>         Attachments: 4-22 performace2.txt, 4-22 performance.txt, 4-22 progress.txt, hive-352-2009-4-15.patch,
hive-352-2009-4-16.patch, hive-352-2009-4-17.patch, hive-352-2009-4-19.patch, hive-352-2009-4-22-2.patch,
hive-352-2009-4-22.patch, hive-352-2009-4-23.patch, hive-352-2009-4-27.patch, HIve-352-draft-2009-03-28.patch,
Hive-352-draft-2009-03-30.patch
>
>
> column based storage has been proven a better storage layout for OLAP. 
> Hive does a great job on raw row oriented storage. In this issue, we will enhance hive
to support column based storage. 
> Acctually we have done some work on column based storage on top of hdfs, i think it will
need some review and refactoring to port it to Hive.
> Any thoughts?

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