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https://issues.apache.org/jira/browse/CASSANDRA-12705?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15528903#comment-15528903
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Nate McCall commented on CASSANDRA-12705:
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bq. the handling of the schema migration during upgrade is missing.
[~Stefania] Thanks for effort so far - should this be patch available, or are
more changes coming?
> Add column definition kind to system schema dropped columns
> -----------------------------------------------------------
>
> Key: CASSANDRA-12705
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12705
> Project: Cassandra
> Issue Type: Bug
> Components: Distributed Metadata
> Reporter: Stefania
> Fix For: 4.0
>
>
> Both regular and static columns can currently be dropped by users, but this
> information is currently not stored in {{SchemaKeyspace.DroppedColumns}}. As
> a consequence, {{CFMetadata.getDroppedColumnDefinition}} returns a regular
> column and this has caused problems such as CASSANDRA-12582.
> We should add the column kind to {{SchemaKeyspace.DroppedColumns}} so that
> {{CFMetadata.getDroppedColumnDefinition}} can create the correct column
> definition. However, altering schema tables would cause inter-node
> communication failures during a rolling upgrade, see CASSANDRA-12236.
> Therefore we should wait for a full schema migration when upgrading to the
> next major version.
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