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From "Eric Evans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4184) Make identifier and value grammar for CQL3 stricter
Date Wed, 25 Apr 2012 14:48:18 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13261682#comment-13261682
] 

Eric Evans commented on CASSANDRA-4184:
---------------------------------------

For what it's worth, allowing IDENT here was done to optimize for user experience in interactive
sessions; To avoid having to quote something if it could be unambiguously parsed.  I believe
it was Jonathan that championed this.

I wasn't in favor of it initially (like you, I was trying to simplify the grammar), but it's
grown on me.


                
> Make identifier and value grammar for CQL3 stricter
> ---------------------------------------------------
>
>                 Key: CASSANDRA-4184
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4184
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: API
>    Affects Versions: 1.1.0
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>              Labels: cql3
>             Fix For: 1.1.1
>
>         Attachments: 0001-Disallow-integer-and-uuid-constants-as-identifier.txt, 0002-Disallow-identifier-as-value.txt
>
>
> The current grammar for CQL3 allows:
> # uuid and integer constants as identifiers
> # identifier as value (aka term in the grammar)
> I think both of those should be removed.
> For 1, mostly because this feels useless and slightly complicates the grammar which is
annoying for the documentation of CQL3 for instance (note that this doesn't mean forbidding
integer or uuid as identifier, but means they have to be double-quoted when used as such).
> For 2, I think that allowing identifier as value is actually misleading, typically if
you write things like {{SELECT foo WHERE foo=foo}}. It suggests we support JOIN when we do
not.
> Also, if both are done, then one will always be able to distinguish between identifier
and value even without any context, which is a nice property.

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