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https://issues.apache.org/jira/browse/CASSANDRA-20331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17928415#comment-17928415
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Stefan Miklosovic commented on CASSANDRA-20331:
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Indeed, I am not going to force anything on anybody here. As I said, an idea to
think about ... As I think about that more, if we have some logic on server
then trying to "duplicate it" in a driver seems like a waste of time and
effort. More complex verification of data would be most probably done on an
application level anyway and constraints we have on a database are the "checks
of the last resort" and if an invalid value is meant to fail on server side, so
it will ...
> 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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