hadoop-hive-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-375) LazySimpleSerDe to directly serialize (append) int/long/byte/short etc to UTF-8 buffer
Date Fri, 27 Mar 2009 04:45:50 GMT

     [ https://issues.apache.org/jira/browse/HIVE-375?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zheng Shao updated HIVE-375:
----------------------------

    Attachment: HIVE-375.2.patch

Added 2 tests and fixed a bug.

> LazySimpleSerDe to directly serialize (append) int/long/byte/short etc to UTF-8 buffer
> --------------------------------------------------------------------------------------
>
>                 Key: HIVE-375
>                 URL: https://issues.apache.org/jira/browse/HIVE-375
>             Project: Hadoop Hive
>          Issue Type: Improvement
>    Affects Versions: 0.3.0
>            Reporter: Zheng Shao
>         Attachments: HIVE-375.1.patch, HIVE-375.2.patch
>
>
> LazySimpleSerDe currently serialize all data into a StringBuilder, and then convert it
to String and then Text.
> Even if the data is of type int/long/byte/short, we still do that unnecessary conversion.
> We should directly serialize/append int/long/byte/short to a UTF-8 buffer.
> This is a very simple change, but it is expected to save 2-3% of the time of a typical
mapper (on a group-by query with some int/long columns).

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message