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https://issues.apache.org/jira/browse/CASSANDRA-20331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17928198#comment-17928198
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Stefan Miklosovic commented on CASSANDRA-20331:
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Virtual is fine. I think the only purpose of this table is to have a logic in
driver which would pro-actively check if that constraint "makes sense" on
creation (we can do that on server) or if a value which a user tries to put
there is not fail.
The idea here is to fail on client's side so we will never reach server which
would do the same. I am not sure how sound this is. Feel free to put this under
scrutiny. Opinions indeed welcomed.
> Expose constraints in system_schema.column_constraints
> ------------------------------------------------------
>
> Key: CASSANDRA-20331
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20331
> Project: Apache Cassandra
> Issue Type: Task
> Components: Feature/Constraints
> Reporter: Stefan Miklosovic
> Assignee: Bernardo Botella Corbi
> Priority: Normal
> Fix For: 5.x
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> There is already system_schema.column_masks
> {code}
> CREATE TABLE system_schema.column_masks (
> keyspace_name text,
> table_name text,
> column_name text,
> function_argument_nulls frozen<list<boolean>>,
> function_argument_types frozen<list<text>>,
> function_argument_values frozen<list<text>>,
> function_keyspace text,
> function_name text,
> PRIMARY KEY (keyspace_name, table_name, column_name)
> ) WITH CLUSTERING ORDER BY (table_name ASC, column_name ASC)
> {code}
> We need this table with constraints of each column, similar to masks. Right
> now there is no programmatic way to realize what constraints a column has.
> This will come handy when Java Driver will start to support this. They will
> just scan system_schema.column_constraints and they can e.g. fail the query
> on client side it will never reach the server ...
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