Alex Petrov commented on CASSANDRA-13994:

[~jjirsa] I would say it's quite important to clean up compact storage 
internals in 4.0 before the release. It should have no visible side-effects, 
but it'd be very good to have as it simplifies multiple code paths.

> Remove COMPACT STORAGE internals before 4.0 release
> ---------------------------------------------------
>                 Key: CASSANDRA-13994
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13994
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Alex Petrov
>            Assignee: Alex Petrov
>            Priority: Minor
>             Fix For: 4.x
> 4.0 comes without thrift (after [CASSANDRA-11115]) and COMPACT STORAGE (after 
> [CASSANDRA-10857]), and since Compact Storage flags are now disabled, all of 
> the related functionality is useless.
> There are still some things to consider:
> 1. One of the system tables (built indexes) was compact. For now, we just 
> added {{value}} column to it to make sure it's backwards-compatible, but we 
> might want to make sure it's just a "normal" table and doesn't have redundant 
> columns.
> 2. Compact Tables were building indexes in {{KEYS}} mode. Removing it is 
> trivial, but this would mean that all built indexes will be defunct. We could 
> log a warning for now and ask users to migrate off those for now and 
> completely remove it from future releases. It's just a couple of classes 
> though.

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