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From "paul cannon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2474) CQL support for compound columns and wide rows
Date Thu, 12 Jan 2012 20:14:40 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13185200#comment-13185200
] 

paul cannon commented on CASSANDRA-2474:
----------------------------------------

bq. I'll also note that this patch (with the things above) make it so that in the CqlMetadata
(in the result), the name_types are not useful anymore (since this is always UTF8), and neither
is the default comparator and default validation types, as we can always set the type of each
columns in the value_types map. I suppose the best way to proceed is to mark them deprecated
for now and remove them in the next version.

This seems possibly too far. Clients ought to be able to know what a CF's default comparator
and validation types are, even if they're not necessary to deserialize column values.

Also, cqlsh has an ASSUME facility similar to the cli one. You can tell cqlsh to deserialize
columns without an explicit column type as though they were something different. Would this
still be possible without being able to tell whether column values had an explicit column_metadata
type, or whether they were using the default?
                
> CQL support for compound columns and wide rows
> ----------------------------------------------
>
>                 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: Sylvain Lebresne
>            Priority: Critical
>              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, cql_tests.py, 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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