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From "Jeremiah Jordan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8005) Server-side DESCRIBE
Date Wed, 01 Oct 2014 03:54:34 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14154306#comment-14154306
] 

Jeremiah Jordan commented on CASSANDRA-8005:
--------------------------------------------

But I don't want to do something machine readable with it. I want to return it back to the
user that asked "how do I make this table again".  With this server side we are close to drivers
not needing to parse schema tables, and able to get all the info they need from native protocol
meta data about a query.  To me this is a good goal to be shooting for.

> Server-side DESCRIBE
> --------------------
>
>                 Key: CASSANDRA-8005
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8005
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: API
>            Reporter: Tyler Hobbs
>            Priority: Minor
>              Labels: cql3
>             Fix For: 3.0
>
>
> The various {{DESCRIBE}} commands are currently implemented by cqlsh, and nearly identical
implementations exist in many drivers.  There are several motivations for making {{DESCRIBE}}
part of the CQL language:
> * Eliminate the (fairly complex) duplicate implementations across drivers and cqlsh
> * Get closer to allowing drivers to not have to fetch the schema tables. (Minor changes
to prepared statements are also needed.)
> * Have instantaneous support for new schema features in cqlsh.  (You currently have to
update the bundled python driver.)
> * Support writing out schemas where it makes sense.  One good example of this is backups.
 You need to restore the schema before restoring data in the case of total loss, so it makes
sense to write out the schema alongside snapshots.



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