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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7458) functional indexes
Date Wed, 01 Oct 2014 12:24:34 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14154738#comment-14154738
] 

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

1. Let's start with just indexing a single column.  We can worry about the other when we start
adding compound indexes in the non-functional case. :)

2. I'm okay with just accepting a single index per column if that simplifies implementation
a great deal, but that's a limitation we'll want to lift sooner than later.

> 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));
> {code}
> http://www.postgresql.org/docs/9.3/static/indexes-expressional.html



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