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From "Pavel Yaskevich (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Edited] (CASSANDRA-2474) CQL support for compound columns
Date Thu, 01 Sep 2011 22:48:10 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13095653#comment-13095653
] 

Pavel Yaskevich edited comment on CASSANDRA-2474 at 9/1/11 10:47 PM:
---------------------------------------------------------------------

we can extend that syntax like this to support multiple columns:

for composite columns:

{noformat}
SELECT :column as (date, company), :value as price FROM stockhist WHERE <key_alias>='GOOG'
AND date >= '2011-01-02' LIMIT 50
{noformat}

for super columns:

{noformat}
SELECT :parent as company, :column as (date, <attr>), :value as (price, <attr_value>)
FROM stockhist WHERE company='GOOG' AND date >= '2011-01-02' AND <key_alias> = '...'
LIMIT 50
{noformat}

Also instead of :column we could use just :name, it might be even cleaner.

      was (Author: xedin):
    we can extend that syntax like this to support multiple columns:

{noformat}
SELECT :column as (date, company), :value as (price, name) FROM stockhist WHERE <key_alias>='GOOG'
AND date >= '2011-01-02' LIMIT 50
{noformat}

{noformat}
SELECT :parent as company, :column as (date, <attr>), :value as (price, <attr_value>)
FROM stockhist WHERE company='GOOG' AND date >= '2011-01-02' AND <key_alias> = '...'
LIMIT 50
{noformat}

Also instead of :column we could use just :name, it might be even cleaner.
  
> 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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