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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-136) SerDe should escape some special characters
Date Mon, 08 Dec 2008 21:42:44 GMT

    [ https://issues.apache.org/jira/browse/HIVE-136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12654585#action_12654585
] 

Zheng Shao commented on HIVE-136:
---------------------------------

The problem breaks down to 3 items:

1. When loading the data, the user would be responsible for providing data in the expected
escaped format. For example, in order to represent in the text file one field containing a
carriage return, it should be written as "\n". Sequence file does not have to escape "\n"
but that will be recommended. Both file formats would need to escape column/item/key separator.

2. When the serde is reading the data, it should unescape the data. This means string.split
need to be replaced by a scan, which will have a little performance loss.

3. When the serde is writing the data, it should escape the data. This also means a scan of
the string and conversion to a new string, which also have a little performance loss.


> SerDe should escape some special characters
> -------------------------------------------
>
>                 Key: HIVE-136
>                 URL: https://issues.apache.org/jira/browse/HIVE-136
>             Project: Hadoop Hive
>          Issue Type: Bug
>            Reporter: Zheng Shao
>
> MetadataTypedColumnsetSerDe and DynamicSerDe should escape some special characters like
'\n' or the column/item/key separator.
> Otherwise the data will look corrupted.

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