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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-756) performance improvement for RCFile and ColumnarSerDe in Hive
Date Sun, 16 Aug 2009 00:49:14 GMT

    [ 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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