Aleksey Yeschenko updated CASSANDRA-14948:
    Status: Ready to Commit  (was: Review In Progress)

> Backport dropped column checks to 3.0 and 3.11
> ----------------------------------------------
>                 Key: CASSANDRA-14948
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14948
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Vincent White
>            Assignee: Vincent White
>            Priority: Low
>             Fix For: 3.0.x, 3.11.x
> This is a follow on from CASSANDRA-14913 and CASSANDRA-14843 that introduced 
> some fixes to prevent and mitigate data corruption caused by dropping a 
> column then re-adding it with the same name but an incompatible type (e.g. 
> simple int to a complex map<>) or different kind (regular/static). 
> This patch backports the checks that now exist in trunk. This does include 
> adding a column to the dropped_columns table to keep track of static columns 
> like trunk, not sure it we are able to make that change in 3.11.x. 
> Also not sure what our stance on backporting just the isValueCompatibleWith 
> check to 3.0 is. I'd be for it since it prevents recreating a simple column 
> as a map (or vice-versa) which will basically always lead to corruption.
> ||C* 3.11.x||
> |[Patch|https://github.com/vincewhite/cassandra/commit/3986b53b8acaf1d3691f9b35fd098a40667c520f]|

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