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https://issues.apache.org/jira/browse/CASSANDRA-12443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15828186#comment-15828186
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Aleksey Yeschenko commented on CASSANDRA-12443:
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There is a small typo in NEWS.txt (UDF fields vs. UDT fields). Other than that
+1.
> 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.x
>
>
> 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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