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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7458) functional indexes
Date Mon, 15 Dec 2014 22:07:14 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14247303#comment-14247303
] 

Jonathan Ellis commented on CASSANDRA-7458:
-------------------------------------------

Fantastic!

> functional indexes
> ------------------
>
>                 Key: CASSANDRA-7458
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7458
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: API, Core
>            Reporter: Jonathan Ellis
>            Assignee: Mikhail Stepura
>             Fix For: 3.0
>
>
> Indexing information derived from the row can be powerful.  For example, using the hypothetical
{{extract_date}} function,
> {code}
> create table ticks (
>     symbol text,
>     ticked_at datetime,
>     price int,
>     tags set<text>,
>     PRIMARY KEY (symbol, ticked_at)
> );
> CREATE INDEX ticks_by_day ON ticks(extract_date(ticked_at));
> SELECT * FROM ticks_by_day WHERE extract_date(ticked_at) = '2014-5-13';
> {code}
> http://www.postgresql.org/docs/9.3/static/indexes-expressional.html



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