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Tyler Hobbs commented on CASSANDRA-7826:
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bq. Is this reasonable to scope for 2.1.1?
That depends on exactly what we want to support.
When you wrap a collection with a tuple, you're serializing the entire
collection into a single cell. This doesn't allow for updating subcollections
(you can only replace them). You also can't fetch subfields of tuples
individually.
We don't currently support fetching individual items from collections, so
there's no way to pull out subcollections.
Basically, wrapping nested collections in tuples is only useful for static data
that you plan to fetch in its entirety.
I would say that if we want to support selecting subfields from collections or
being able to update individual items in nested collections, 3.0 is the
earliest we should do that.
> support arbitrary nesting of collection
> ---------------------------------------
>
> Key: CASSANDRA-7826
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7826
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Tupshin Harper
> Assignee: Tyler Hobbs
> Labels: ponies
>
> The inability to nest collections is one of the bigger data modelling
> limitations we have right now.
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