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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4416) Include metadata for system keyspace itself in schema_* tables
Date Mon, 01 Oct 2012 13:56:08 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13466803#comment-13466803
] 

Sylvain Lebresne commented on CASSANDRA-4416:
---------------------------------------------

Oh right, I shouldn't review tickets before my second coffee. +1.
                
> Include metadata for system keyspace itself in schema_* tables
> --------------------------------------------------------------
>
>                 Key: CASSANDRA-4416
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4416
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 1.2.0 beta 1
>            Reporter: paul cannon
>            Assignee: Jonathan Ellis
>            Priority: Minor
>              Labels: cql, cql3
>             Fix For: 1.2.0 beta 2
>
>         Attachments: 4416.txt
>
>
> The `system.schema_keyspaces`, `system.schema_columnfamilies`, and `system.schema_columns`
virtual tables allow clients to query schema and layout information through CQL. This will
be invaluable when users start to make more use of the CQL-only protocol (CASSANDRA-2478),
since there will be no other way to determine certain information about available columnfamilies,
keyspaces, or show metadata about them.
> However, the system keyspace itself, and all the columnfamilies in it, are not represented
in the schema_* tables:
> {noformat}
> cqlsh> select * from system.schema_keyspaces where "keyspace" = 'system';
> cqlsh> 
> cqlsh> select * from system.schema_columnfamilies where "keyspace" = 'system';
> cqlsh> 
> cqlsh> select * from system.schema_columns where "keyspace" = 'system';
> cqlsh> 
> {noformat}
> It would be greatly helpful to clients which do more introspection than the minimum (say,
for example, cqlsh) to be able to get information on the structure and availability of schema-definition
tables.

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