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Date: Sat, 15 Aug 2009 17:49:14 -0700 (PDT)
From: "Zheng Shao (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Subject: [jira] Commented: (HIVE-756) performance improvement for RCFile and
 ColumnarSerDe in Hive
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    [ https://issues.apache.org/jira/browse/HIVE-756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12743792#action_12743792 ] 

Zheng Shao commented on HIVE-756:
---------------------------------

@hive-756.patch: line 121:
Can we distinguish between the following 2 cases?
1. Columns information is provided but empty: we ignore all columns
2. Columns information is not provided: we read all columns.
In this way if the caller (some non-hive applications) does not know the RCFile column information settings, it can still read in all columns.

> performance improvement for RCFile and ColumnarSerDe in Hive
> ------------------------------------------------------------
>
>                 Key: HIVE-756
>                 URL: https://issues.apache.org/jira/browse/HIVE-756
>             Project: Hadoop Hive
>          Issue Type: Improvement
>            Reporter: Ning Zhang
>            Assignee: Ning Zhang
>         Attachments: hive-756.patch
>
>
> There are some easy performance improvements in the columnar storage in Hive I found during Hackathon. 

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