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https://issues.apache.org/jira/browse/CASSANDRA-4416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13466799#comment-13466799
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Jonathan Ellis edited comment on CASSANDRA-4416 at 10/2/12 12:50 AM:
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Hmm, I still don't see it... we run
{code}
DELETE FROM system.{schema_keyspaces, schema_columnfamilies, schema_columns}
WHERE keyspace_name = '{system, system_traces}'
{code}
so system_traces is the partition key of the data being removed, not the
keyspace we're DELETEing from.
was (Author: jbellis):
Hmm, I still don't see it... we run
{{DELETE FROM system.{schema_keyspaces, schema_columnfamilies, schema_columns}
WHERE keyspace_name = '{system, system_traces}'}}
so system_traces is the partition key of the data being removed, not the
keyspace we're DELETEing from.
> 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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