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From "Jonathan Ellis (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3647) Support arbitrarily nested "documents" in CQL
Date Mon, 09 Apr 2012 22:39:19 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13250261#comment-13250261
] 

Jonathan Ellis commented on CASSANDRA-3647:
-------------------------------------------

Those are good ideas, but I'm going to be the bad guy in the name of keeping this in-scope
for 1.2. :)

The crucial idea here is to provide *nested* collections for convenience; if it's so big you
need to page it, it probably belongs in a separate row.  So paging is not on my short list
to start with.

I also chose the word "list" over "deque" because I cannot think of a way to provide push-front
efficiently (i.e., without read-before-write, and without update-all-existing-list-items).
 As I mentioned in passing, we can provide append efficiently by using v1 uuids as column
names (and translating to list indexes in QueryProcessor), but that doesn't give us anything
else for "free."  Open to suggestions if you have a better design in mind, of course.
                
> Support arbitrarily nested "documents" in CQL
> ---------------------------------------------
>
>                 Key: CASSANDRA-3647
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3647
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: API, Core
>            Reporter: Jonathan Ellis
>              Labels: cql
>
> Composite columns introduce the ability to have arbitrarily nested data in a Cassandra
row.  We should expose this through CQL.

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