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https://issues.apache.org/jira/browse/CASSANDRA-4511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13825926#comment-13825926
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Jeremiah Jordan commented on CASSANDRA-4511:
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I definitely think being able to index the key of a map is useful. There are
many times it would have been nice for me to be able to query "what rows have
this dynamic column", I actually built my own 2i's so I could do that... Since
maps are basically one of the big replacements for dynamic columns, I think it
would be very useful to index the keys.
> Secondary index support for CQL3 collections
> ---------------------------------------------
>
> Key: CASSANDRA-4511
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4511
> Project: Cassandra
> Issue Type: Improvement
> Affects Versions: 1.2.0 beta 1
> Reporter: Sylvain Lebresne
> Assignee: Sylvain Lebresne
> Fix For: 2.1
>
> Attachments: 4511.txt
>
>
> We should allow to 2ndary index on collections. A typical use case would be
> to add a 'tag set<String>' to say a user profile and to query users based on
> what tag they have.
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