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