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https://issues.apache.org/jira/browse/CASSANDRA-3647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13249949#comment-13249949
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Jonathan Ellis commented on CASSANDRA-3647:
-------------------------------------------

The alternative is we say "all maps, lists, and sets will be represented as 
CT(ascii, UTF8)" and json-encode things.  On the one hand, that's horribly 
inefficient space-wise for ints and uuids.  On the other hand, json support is 
high on the list of motivations here, and that would simplify things a lot.  
(And if we used a library to represent utf8 as byte[] instead of String, that 
would mitigate the overhead of representing as json by roughly 50% for common 
usage.)
                
> Support arbitrarily nested "documents" in CQL
> ---------------------------------------------
>
>                 Key: CASSANDRA-3647
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3647
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: API, Core
>            Reporter: Jonathan Ellis
>              Labels: cql
>
> Composite columns introduce the ability to have arbitrarily nested data in a 
> Cassandra row.  We should expose this through CQL.

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