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https://issues.apache.org/jira/browse/CASSANDRA-7396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16023597#comment-16023597
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Robert Stupp commented on CASSANDRA-7396:
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Well, restricting the first slice with a second slice ({{m\[1..\]\[2..\]}})
doesn't buy anything ({{headMap().tailMap()}} is not the same as what a slice
with absolute bounds does).
The confusing thing is that the second restriction for {{m\[1\]\[2\]}} refers
to the "inner" map but the second restriction in for {{m\[1..\]\[2..\]}} still
refers to the "outer" map. As you said, that requires "manual filtering"
(cannot be expressed as a cell filter). That's way I proposed to forbid further
restrictions after a slice. This would be consistent to what we already do for
clustering keys and inequality predicates.
> Allow selecting Map key, List index
> -----------------------------------
>
> Key: CASSANDRA-7396
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7396
> Project: Cassandra
> Issue Type: New Feature
> Components: CQL
> Reporter: Jonathan Ellis
> Assignee: Sylvain Lebresne
> Labels: cql, docs-impacting
> Fix For: 4.x
>
> Attachments: 7396_unit_tests.txt
>
>
> Allow "SELECT map['key]" and "SELECT list[index]." (Selecting a UDT subfield
> is already supported.)
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