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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-352) Make Hive support column based storage
Date Mon, 30 Mar 2009 05:26:50 GMT

    [ https://issues.apache.org/jira/browse/HIVE-352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12693664#action_12693664
] 

Zheng Shao commented on HIVE-352:
---------------------------------

Haven't looked it completely through yet.

Some initial comments:

BytesRefWritable.java: You might want to replace all BytesWritable to BytesRefWritable.
86: I don't understand why equal() can be implemented like this.

ColumnarSerDe.java: You might want to refactor LazySimpleSerDe to extract out the common functionality,
(and reuse them in ColumnarSerDe), instead of inheriting from LazySimpleSerDe.  This will
give you much better control -  the current implementation won't work unless you also override
initialize(), serialize() - basically all methods from LazySimpleSerDe.

If you would like to refactor LazySimpleSerDe to extract out the common functionality for
ColumnarSerDe, make sure you follow HIVE-375.


Since HIVE-375 is not committed yet, you might want to work on HIVE-360 first.


> 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
>         Attachments: HIve-352-draft-2009-03-28.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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