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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4138) [Hive] refactor the SerDe library
Date Mon, 15 Sep 2008 21:49:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12631150#action_12631150
] 

Zheng Shao commented on HADOOP-4138:
------------------------------------

The factory (cache) makes sure there is only one instance of an ObjectInspector for a particular
configuration, so Object.equals() is good enough. That makes the comparison really fast (which
will be useful if we want to compare the ObjectInspector of the last row with this row for
each of the rows).


> [Hive] refactor the SerDe library
> ---------------------------------
>
>                 Key: HADOOP-4138
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4138
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: contrib/hive
>            Reporter: Zheng Shao
>            Assignee: Zheng Shao
>             Fix For: 0.19.0
>
>         Attachments: HADOOP-4138-1.txt, HADOOP-4138-2.txt, HADOOP-4138-3.txt, HADOOP-4138-4.txt
>
>
> Hive uses the library from src/contrib/hive/serde to do serialization/deserialization.
> We want to do a refactoring of the library to:
> 1. Split Serializer and Deserializer interface
> 2. Split Serializer/Deserializer and ObjectInspector interface
> 3. Change hive/metaserver and hive/ql to use the new SerDe framework

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