Benjamin Lerer commented on CASSANDRA-7423:

Can you create a separate ticket?

> Allow updating individual subfields of UDT
> ------------------------------------------
>                 Key: CASSANDRA-7423
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7423
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: CQL
>            Reporter: Tupshin Harper
>            Assignee: Tyler Hobbs
>            Priority: Major
>              Labels: client-impacting, cql, docs-impacting
>             Fix For: 3.6
> Since user defined types were implemented in CASSANDRA-5590 as blobs (you 
> have to rewrite the entire type in order to make any modifications), they 
> can't be safely used without LWT for any operation that wants to modify a 
> subset of the UDT's fields by any client process that is not authoritative 
> for the entire blob. 
> When trying to use UDTs to model complex records (particularly with nesting), 
> this is not an exceptional circumstance, this is the totally expected normal 
> situation. 
> The use of UDTs for anything non-trivial is harmful to either performance or 
> consistency or both.
> edit: to clarify, i believe that most potential uses of UDTs should be 
> considered anti-patterns until/unless we have field-level r/w access to 
> individual elements of the UDT, with individual timestamps and standard LWW 
> semantics

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