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From "Jeremiah Jordan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-14825) Expose table schema for drivers
Date Fri, 09 Nov 2018 16:17:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-14825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16681660#comment-16681660
] 

Jeremiah Jordan commented on CASSANDRA-14825:
---------------------------------------------

Wether we add DESCRIBE or we have a virtual table or even both, we return data in result sets.
 If you want to be able to query the whole schema in a single query I can think of two reasonable
options:
1. Return a single row and column that just has the entire schema in it.
2. Return one row per schema object with columns something like: keyspace, name, type, cql

The current patch here proposes a different table per object type. I don’t think that is
as usable as a being able to get a single result set with all schema objects in it. You require
multiple querys and the user has to know how to put them back together in the right order
to generate a valid schema cql file for use in a restore.  With a single row containing the
whole schema it can be in the right order or with a single resultset for all objects the rows
can be returned in the correct order for replay.

> Expose table schema for drivers
> -------------------------------
>
>                 Key: CASSANDRA-14825
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14825
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Chris Lohfink
>            Assignee: Chris Lohfink
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 20m
>  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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