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From "Jonathan Ellis (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2474) CQL support for compound columns
Date Tue, 20 Dec 2011 20:25:31 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13173480#comment-13173480
] 

Jonathan Ellis commented on CASSANDRA-2474:
-------------------------------------------

bq. I didn't though the goal was to 'adapt to the relational philosophy'

All data is relational, the only question is implementation details. :)

Seriously though, "send a query, get back rows" is a good design for a language + driver,
and you simply can't represent slices of wide, composite rows sanely that way without something
like transposition to expose the structure "hidden" underneath.

bq. WITH comparator = composite(sender,thread,tid);

Wouldn't you need body in the composite list too?

bq. --Finally in the case of both SPARSE/DENSE

So this is basically what I gave, right?  It sounds like you're bikeshedding the TRANSPOSED
/ WITH COMPARATOR syntax but not really solving the problem I outlined.  Maybe I'm missing
something.
                
> CQL support for compound columns
> --------------------------------
>
>                 Key: CASSANDRA-2474
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2474
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: API, Core
>            Reporter: Eric Evans
>            Assignee: Pavel Yaskevich
>              Labels: cql
>             Fix For: 1.1
>
>         Attachments: 2474-transposed-1.PNG, 2474-transposed-raw.PNG, 2474-transposed-select-no-sparse.PNG,
2474-transposed-select.PNG, raw_composite.txt, screenshot-1.jpg, screenshot-2.jpg
>
>
> For the most part, this boils down to supporting the specification of compound column
names (the CQL syntax is colon-delimted terms), and then teaching the decoders (drivers) to
create structures from the results.

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