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From "Sylvain Lebresne (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-7622) Implement virtual tables
Date Wed, 08 Jun 2016 17:13:21 GMT


Sylvain Lebresne commented on CASSANDRA-7622:

bq. Sure, but SHOW is a common enough command in DB world

Imo, the general mechanism of virtual tables should be just an implementation detail for exposing
a table. That means even in the case of {{SHOW VARIABLES}}, we'd really be adding a new system
table with those variables, and we'll be able to query it through normal select. That certainly
doesn't prevent us for supporting {{SHOW VARIABLES}} as syntactic sugar for the equivalent
select statement. This might even make sense as a cqlsh thing (rather than a CQL one).

> Implement virtual tables
> ------------------------
>                 Key: CASSANDRA-7622
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Tupshin Harper
>            Assignee: Jeff Jirsa
>             Fix For: 3.x
> There are a variety of reasons to want virtual tables, which would be any table that
would be backed by an API, rather than data explicitly managed and stored as sstables.
> One possible use case would be to expose JMX data through CQL as a resurrection of CASSANDRA-3527.
> Another is a more general framework to implement the ability to expose yaml configuration
information. So it would be an alternate approach to CASSANDRA-7370.
> A possible implementation would be in terms of CASSANDRA-7443, but I am not presupposing.

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