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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-3386) Document how to import NULL values into a table at LanguageManual+Types (\N with Lazy SerDe)
Date Fri, 17 Aug 2012 10:56:38 GMT

     [ https://issues.apache.org/jira/browse/HIVE-3386?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lefty Leverenz reassigned HIVE-3386:
------------------------------------

    Assignee: Lefty Leverenz
    
> Document how to import NULL values into a table at LanguageManual+Types (\N with Lazy
SerDe)
> --------------------------------------------------------------------------------------------
>
>                 Key: HIVE-3386
>                 URL: https://issues.apache.org/jira/browse/HIVE-3386
>             Project: Hive
>          Issue Type: Improvement
>          Components: Documentation
>    Affects Versions: 0.9.0
>            Reporter: Jakub Holy
>            Assignee: Lefty Leverenz
>
> The documentation at https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Types
should be enhanced as follows:
> ---
> Handling of NULL values
> Missing values are represented by the special value NULL. To import data with NULL fields,
check documentation of the SerDe used by the table. (The default Text Format uses LazySimpleSerDe
which interprets the string \N as NULL when importing.)
> ---
> Reason:
> It's nearly impossible to find out how to make e.g. a string field to be NULL in hive
without lot of googling. This is an important thing and should be documented properly at a
clearly visible place (the Data Types page seems to be the most logical place to me though
LanguageManual+DML would certainly also be a good place).

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