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Posted to dev@hive.apache.org by "Zheng Shao (JIRA)" <ji...@apache.org> on 2009/08/16 02:49:14 UTC
[jira] Commented: (HIVE-756) performance improvement for RCFile and
ColumnarSerDe in Hive
[ 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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