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https://issues.apache.org/jira/browse/CASSANDRA-15203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16881883#comment-16881883
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Benedict commented on CASSANDRA-15203:
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Relatedly, CASSANDRA-14846
> Fix AlterTableStatement dropped type validation order
> -----------------------------------------------------
>
> Key: CASSANDRA-15203
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15203
> Project: Cassandra
> Issue Type: Bug
> Components: Cluster/Schema
> Reporter: Aleksey Yeschenko
> Assignee: Aleksey Yeschenko
> Priority: Normal
> Fix For: 4.0
>
>
> 4.0 has a minor bug in AlterTableStatement, in which we compare value
> compatibility of dropped type with new type instead of the other way around
> (and order is significant here).
> This results in more conversions identified as valid than should be allowed
> to.
> The fix is a trivial one-liner.
> Relatedly, we should audit all implementations of {{isValueCompatible()}} out
> there - at least one, {{BytesType}} - is no longer valid in 3.0+, since
> {{BytesType}} can no longer correctly read any complex column. And perhaps go
> even further, and restrict column recreation to only previously dropped type
> *precisely*, for which I have a couple arguments as well.
> That said, I'd like to defer those to a different ticket.
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