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https://issues.apache.org/jira/browse/CASSANDRA-12373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16138350#comment-16138350
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Sylvain Lebresne commented on CASSANDRA-12373:
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bq. but in 3.x we started exposing the defined columns as "static" and the 
undefined ones as column1/value.

That's not exactly true. It's how we handle CS tables internally, but it's not 
how they are exposed. That's where CASSANDRA-10857 come in, as it's goal is 
exactly to allow exposing that internal layout and this will work for all 
compact tables, SCF included (and yes, all the data will be exposed this way). 

> 3.0 breaks CQL compatibility with super columns families
> --------------------------------------------------------
>
>                 Key: CASSANDRA-12373
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12373
>             Project: Cassandra
>          Issue Type: Bug
>          Components: CQL
>            Reporter: Sylvain Lebresne
>            Assignee: Alex Petrov
>             Fix For: 3.0.x, 3.11.x
>
>
> This is a follow-up to CASSANDRA-12335 to fix the CQL side of super column 
> compatibility.
> The details and a proposed solution can be found in the comments of 
> CASSANDRA-12335 but the crux of the issue is that super column famillies show 
> up differently in CQL in 3.0.x/3.x compared to 2.x, hence breaking backward 
> compatibilty.



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