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https://issues.apache.org/jira/browse/CASSANDRA-2480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pavel Yaskevich updated CASSANDRA-2480:
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Attachment: CASSANDRA-2480-v2.patch
v2 introduces following behavior: when alias key was set you won't be able to
use KEY keyword in any of the operations for that CF - UPDATE, INSERT, SELECT,
DELETE.
> Named keys / virtual columns
> ----------------------------
>
> Key: CASSANDRA-2480
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2480
> Project: Cassandra
> Issue Type: Sub-task
> Components: API, Core
> Reporter: Eric Evans
> Assignee: Pavel Yaskevich
> Labels: cql
> Fix For: 0.8.1, 1.0
>
> Attachments: CASSANDRA-2480-v2.patch, CASSANDRA-2480.patch
>
>
> With the completion of CASSANDRA-2396, it is now possible to attach a name to
> keys (column family-wide). This could be utilized to introduce the concept
> of "virtual columns" in CQL. Here's how that would work:
> Typically you would use the CQL keyword {{KEY}} to specify a row key, for
> example:
> {code:SQL|title=CQL 1.0}
> INSERT INTO cf (KEY, name1, name2) VALUES (key1, value1, value2)
> -- or alternately
> UPDATE cf SET name1 = value1, name2 = value2 WHERE KEY = key1
> SELECT name1,name2 FROM cf WHERE KEY = key1
> {code}
> For CQL 1.1, that syntax would continue to work, but upon the completion of
> this issue it should also be possible to assign a name to the key and treat
> as if it were another column. For example:
> {code:SQL|title=CQL 1.1}
> INSERT INTO cf (keyname, name1, name2) VALUES (key1, value1, value2)
> -- or alternately
> UPDATE cf SET name1 = value1, name2 = value2 WHERE keyname = key1
> -- Note how the keyname can now be used in the projection
> SELECT keyname, name1, name2 FROM cf WHERE keyname = key1
> -- And, there is no restriction on the order
> SELECT name1, name2, keyname FROM cf WHERE keyname = key1 AND name2 = value2
> {code}
> The semantics will be such that the existing behavior is maintained (read:
> when using the {{KEY}} keyword), but if the key is named, and the name is
> used in a {{SELECT}}, the key's name and value will be returned in the column
> results, sorted according to the comparator (_Note: we'll need to figure out
> what that means with respect to differently typed keys_).
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