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From "Pavel Yaskevich (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2474) CQL support for compound columns
Date Mon, 05 Sep 2011 15:00:12 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13097166#comment-13097166
] 

Pavel Yaskevich commented on CASSANDRA-2474:
--------------------------------------------

if we consider that timestamp is key and event_id, category and subcategory is composite name
then:

bq. Give me all the events for time t, category c and sub-category sc

{noformat}
SELECT name AS (event_id, category, subcategory), value AS event FROM events WHERE key = <timestamp>
AND category = <name> AND subcategory = <name>;
{noformat}

bq. Give me all the events for time t and category c

{noformat}
SELECT name AS (event_id, category, *), value AS event FROM events WHERE key = <timestamp>
AND category = <name>;
{noformat}

bq. Give me all the events for time t and category c1 to c2 (where c1 < c2 for the category
sorting)

{noformat}
SELECT name AS (event_id, category, *), value AS event FROM events WHERE key = <timestamp>
AND category > c1 AND category < c2;
{noformat}

bq. Give me everything for the last 4 hours

{noformat}
SELECT name AS (event_id, category, *), value AS event FROM events WHERE key > <timestamp>
AND key < <timestamp>;
{noformat}

> CQL support for compound columns
> --------------------------------
>
>                 Key: CASSANDRA-2474
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2474
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: API, Core
>            Reporter: Eric Evans
>            Assignee: Pavel Yaskevich
>              Labels: cql
>             Fix For: 1.0
>
>         Attachments: 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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