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https://issues.apache.org/jira/browse/CASSANDRA-7458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14154258#comment-14154258
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Mikhail Stepura commented on CASSANDRA-7458:
--------------------------------------------
A couple of questions about the scope of this ticket:
# Do we want to support functions with arbitrary number of arguments
{{f(x1,x2,...,column,...,xn)}} or just simple single argument functions
{{f(column)}}?
# Do we want to allow more than 1 index per a column?
> 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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