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https://issues.apache.org/jira/browse/CASSANDRA-12443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15830081#comment-15830081
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Aleksey Yeschenko commented on CASSANDRA-12443:
-----------------------------------------------

Oh, but you aren't taking into account the fact that all that schema code was 
written by drunk baboons. Any change to active {{CFMetaData}}s in the system 
are still done through the {{apply()}} call, until that amazing author of 
CASSANDRA-9425 commits his first patch.

> Remove alter type support
> -------------------------
>
>                 Key: CASSANDRA-12443
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12443
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Carl Yeksigian
>            Assignee: Carl Yeksigian
>             Fix For: 3.0.11, 3.10
>
>
> Currently, we allow altering of types. However, because we no longer store 
> the length for all types anymore, switching from a fixed-width to 
> variable-width type causes issues. commitlog playback breaking startup, 
> queries currently in flight getting back bad results, and special casing 
> required to handle the changes. In addition, this would solve 
> CASSANDRA-10309, as there is no possibility of the types changing while an 
> SSTableReader is open.
> For fixed-length, compatible types, the alter also doesn't add much over a 
> cast, so users could use that in order to retrieve the altered type.



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