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https://issues.apache.org/jira/browse/CASSANDRA-14846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16670616#comment-16670616
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Benedict commented on CASSANDRA-14846:
--------------------------------------
If we want to we could still offer a power user capability to "undrop" a column
in the old manner. It could even be part of the CQL grammar (though I'm not
sure this would be desirable)
> Drop/Add Column Pre-existing Data Inconsistency
> -----------------------------------------------
>
> Key: CASSANDRA-14846
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14846
> Project: Cassandra
> Issue Type: Bug
> Reporter: Benedict
> Priority: Major
>
> If we drop a column, any data that is compacted before we add a column with
> the same name (and compatible type) will be lost, but any data that was not
> compacted will continue to be returned. This seems problematic - surely we
> should consider all data prior to a Drop to be lost? Re-adding a column of
> the same name should reset the column’s contents?
> This would also permit us to not worry about the types being consistent in
> the case of a dropped column (only alter column need worry about this)
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