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From "Prasanth J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-2726) Handling legitimate NULL values
Date Thu, 14 Jun 2012 04:46:43 GMT

    [ https://issues.apache.org/jira/browse/PIG-2726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13294806#comment-13294806
] 

Prasanth J commented on PIG-2726:
---------------------------------

This patch converts null values in dimensions to "unknown" and uses actual null value for
rollup. For a sample input 

red, ,12

CUBE operator will now generate

red,unknown,12
 ,unknown,12
red, ,12
 , ,12

Please let me know if it is ok to go ahead with null for rollup? another alternative would
be to use "*" or "all" to represent rollup value. 
                
> Handling legitimate NULL values
> -------------------------------
>
>                 Key: PIG-2726
>                 URL: https://issues.apache.org/jira/browse/PIG-2726
>             Project: Pig
>          Issue Type: Sub-task
>    Affects Versions: 0.11
>            Reporter: Prasanth J
>            Assignee: Prasanth J
>         Attachments: PIG-2726.1.patch
>
>
> Look into SQL/Oracle server for how they are handling legitimate NULL values in the input
while performing operations like roll-up, filtering etc. Current implementation outputs NULL
string which should be replaced by actual null value.

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