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https://issues.apache.org/jira/browse/CASSANDRA-15604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17051472#comment-17051472
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Olivier Michallat commented on CASSANDRA-15604:
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Yes, backward compatibility for direct schema table queries is a legitimate
concern as well.
CASSANDRA-14825 will indeed address this, as the driver will be able to get the
correct statement directly from Cassandra instead of piecing it together itself.
As I said it's not a big deal and we have a workaround (even until 14825 gets
in), so feel free to close this if backward compatibility is considered more
important.
> Remove obsolete table/MV options from schema tables
> ---------------------------------------------------
>
> Key: CASSANDRA-15604
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15604
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Olivier Michallat
> Priority: Normal
>
> CASSANDRA-13910 removed the {{read_repair_chance}} and
> {{dclocal_read_repair_chance}} options for tables and materialized views.
> CASSANDRA-12868 made {{default_time_to_live}} illegal for materialized views.
> However the corresponding columns still exist in {{system_schema.tables}} and
> {{system_schema.views}}. Maybe it would make sense to remove them in
> Cassandra 4. Historically, obsolete options have been removed in similar
> cases, for example {{compaction_strategy_class}},
> {{compaction_strategy_options}} and {{compression_parameters}} were present
> in 2.2 but removed in 3.0 (arguably there was also a major refactoring of
> schema tables during that transition).
> This is not a huge deal, but it would make things a bit easier for the Java
> driver (our metadata exposes a "client-side describe" feature, and currently
> we assume that any column in the schema table must be added to the CREATE
> TABLE statement).
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