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https://issues.apache.org/jira/browse/CASSANDRA-10339?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Stupp updated CASSANDRA-10339:
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Fix Version/s: 3.0.x
2.2.x
2.1.x
> Prevent ALTER TYPE from creating circular references
> ----------------------------------------------------
>
> Key: CASSANDRA-10339
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10339
> Project: Cassandra
> Issue Type: Bug
> Reporter: Olivier Michallat
> Assignee: Robert Stupp
> Priority: Minor
> Fix For: 2.1.x, 2.2.x, 3.0.x
>
>
> It's possible to define circular/recursive types using {{ALTER TYPE}}. They
> won't work in practice when you try to insert data, but we should detect this
> earlier and prevent the type modification.
> Recursive type example (from
> [JAVA-908|https://datastax-oss.atlassian.net/browse/JAVA-908]):
> {code}
> CREATE TYPE node (name text,);
> ALTER TYPE node ADD children frozen<list<node>>;
> {code}
> Circular example (from [Stack
> overflow|http://stackoverflow.com/questions/29037733/cassandra-2-1-recursion-by-nesting-udts]):
> {code}
> create type ping(pingid int);
> create type pong(pongid int, ping frozen<ping>);
> alter type ping ADD pong frozen<pong>;
> {code}
> Note that, in the circular example, references are properly checked when
> dropping the types, so neither type can be dropped.
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