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https://issues.apache.org/jira/browse/CASSANDRA-3700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13181420#comment-13181420
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Sylvain Lebresne commented on CASSANDRA-3700:
---------------------------------------------

Is there a real advantage to allow the use of key alias *or* KEY. That is, why 
don't we just allow the key alias, and have this be KEY (which we already do) 
by default for CF created through thrift without a proper key_alias (case that 
is hopefully bound to disappear). The fact that we reserve KEY (and key too I 
believe) is kind of limiting in that you cannot use KEY for some other column.
Besides, the KEY notation will be slightly less meaningful post-2474 because it 
will not necessarily correspond to the primary key anymore (i.e, it may 
correspond only to the first column column that compose the PRIMARY KEY).
                
> SelectStatement start/end key are not set correctly when a key alias is 
> involved
> --------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-3700
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3700
>             Project: Cassandra
>          Issue Type: Bug
>          Components: API
>    Affects Versions: 0.8.1
>            Reporter: Jonathan Ellis
>            Assignee: Pavel Yaskevich
>              Labels: cql
>             Fix For: 1.0.8
>
>         Attachments: CASSANDRA-3700.patch
>
>
> start/end key are set by antlr in WhereClause, but this depends on the "KEY" 
> keyword.

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