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https://issues.apache.org/jira/browse/CASSANDRA-14825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16924320#comment-16924320
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Aleksey Yeschenko commented on CASSANDRA-14825:
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I think I've been on all three sides of this argument over the past years.
Ever since I rewrote the schema system tables for 3.0 in CASSANDRA-6717, the
code to generate 3.0+ from system tables has been relatively easy. It will
become even easier in 4.0 with {{COMPACT STORAGE}} gone. So I've never felt
strongly about a need to have a server-side {{DESCRIBE}} variant in any shape
or form.
But, much like [~slebresne], I've come around since then. There is value in a
server-side {{DESCRIBE}} implementation. Less than there was before, and will
be even less once 4.0 is out, but there still is.
Now, I love that we have virtual tables now, and I can see this functionality
implemented using them. But my preference would be slightly in favour of moving
{{cqlsh}} {{DESCRIBE}} into its set of standalone CQL statements, on balance.
It's not at all invasive, IMO, but would allow us to have nice tailored
grammar, more flexible than a generic {{SELECT}} statement could ever be.
> Expose table schema for drivers
> -------------------------------
>
> Key: CASSANDRA-14825
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14825
> Project: Cassandra
> Issue Type: Improvement
> Components: Legacy/CQL
> Reporter: Chris Lohfink
> Assignee: Chris Lohfink
> Priority: Normal
> Labels: pull-request-available
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> Currently the drivers recreate the CQL for the tables by putting together the
> system table values. This is very difficult to keep up to date and buggy
> enough that its only even supported in Java and Python drivers. Cassandra
> already has some limited output available for snapshots that we could provide
> in a virtual table or new query that the drivers can fetch. This can greatly
> reduce the complexity of drivers while also reducing bugs like
> CASSANDRA-14822 as the underlying schema and properties change.
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