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From Michał Michalski (JIRA) <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3783) Add 'null' support to CQL 3.0
Date Tue, 19 Feb 2013 12:33:14 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13581244#comment-13581244
] 

Michał Michalski commented on CASSANDRA-3783:
---------------------------------------------

Thanks for explainations, Sylvain. I think I understand the general idea, but I'm not sure
if I understood the implementation details you mentioned in 100% as I'm still "discovering"
C* codebase, so I'll try to push this task forward a bit and post an updated patch in a day
or two, asking for your quick review :-)
                
> Add 'null' support to CQL 3.0
> -----------------------------
>
>                 Key: CASSANDRA-3783
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3783
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: API
>            Reporter: Sylvain Lebresne
>            Priority: Minor
>              Labels: cql3
>             Fix For: 1.2.2
>
>         Attachments: 3783-wip-v1.patch
>
>
> Dense composite supports adding records where only a prefix of all the component specifying
the key is defined. In other words, with:
> {noformat}
> CREATE TABLE connections (
>    userid int,
>    ip text,
>    port int,
>    protocol text,
>    time timestamp,
>    PRIMARY KEY (userid, ip, port, protocol)
> ) WITH COMPACT STORAGE
> {noformat}
> you can insert
> {noformat}
> INSERT INTO connections (userid, ip, port, time) VALUES (2, '192.168.0.1', 80, 123456789);
> {noformat}
> You cannot however select that column specifically (i.e, without selecting column (2,
'192.168.0.1', 80, 'http') for instance).
> This ticket proposes to allow that though 'null', i.e. to allow
> {noformat}
> SELECT * FROM connections WHERE userid = 2 AND ip = '192.168.0.1' AND port = 80 AND protocol
= null;
> {noformat}
> It would then also make sense to support:
> {noformat}
> INSERT INTO connections (userid, ip, port, protocol, time) VALUES (2, '192.168.0.1',
80, null, 123456789);
> {noformat}
> as an equivalent to the insert query above.

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