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https://issues.apache.org/jira/browse/CASSANDRA-3628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13172552#comment-13172552
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Brandon Williams commented on CASSANDRA-3628:
---------------------------------------------

It seems like 'glossing over nulls when deletes are disabled' might be a bad 
idea, and make for very difficult to debug problems later.
                
> Make Pig/CassandraStorage delete functionality disabled by default and 
> configurable
> -----------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-3628
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3628
>             Project: Cassandra
>          Issue Type: Task
>            Reporter: Jeremy Hanna
>            Assignee: Jeremy Hanna
>              Labels: pig
>             Fix For: 1.0.7, 1.1
>
>         Attachments: 3628.txt
>
>
> Right now, there is a way to delete column with the CassandraStorage 
> loadstorefunc.  In practice it is a bad idea to have that enabled by default. 
>  A scenario: do an outer join and you don't have a value for something and 
> then you write out to cassandra all of the attributes of that relation.  
> You've just inadvertently deleted a column for all the rows that didn't have 
> that value as a result of the outer join.  It can be argued that you want to 
> be careful with how you project after the join.  However, I would think 
> disabling by default and having a configurable property to enable it for the 
> instances when you explicitly want to use it is the right plan.
> Fwiw, we had a bug in one of our scripts that did exactly as described above. 
>  It's good to fix the bug.  It's bad to implicitly delete data.

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