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https://issues.apache.org/jira/browse/CASSANDRA-16439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17283341#comment-17283341
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David Capwell commented on CASSANDRA-16439:
-------------------------------------------

+1 from me.  Marked CASSANDRA-16233 as a duplicate of this as it looks like I 
forgot about replace and this patch fixes it...  =D

> Reduce new reserved keywords introduced since 3.0
> -------------------------------------------------
>
>                 Key: CASSANDRA-16439
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16439
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: CQL/Syntax
>            Reporter: Jon Meredith
>            Assignee: Jon Meredith
>            Priority: Normal
>             Fix For: 4.0-beta
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> Building on CASSANDRA-16398, for users upgrading from 3.0 to 4.0 there have 
> been a few new reserved keywords added that can cause problems with schema 
> changes and queries in existing applications. Reducing the number of new 
> reserved words makes upgrades easier for users.
> {code:java}
> K_DEFAULT
> K_MBEAN
> K_MBEANS
> K_NEGATIVE_INFINITY
> K_NEGATIVE_NAN
> K_POSITIVE_INFINITY
> K_POSITIVE_NAN
> K_REPLACE
> K_SCHEMA
> K_UNSET
> {code}
> I think they can all be removed from the ReservedWords lists (where present) 
> and added to {{basic_unreserved_keyword}} with the exception of the {\{NAN}} 
> and \{{INFINITY}} as there could be ambiguity between a selected field and a 
> nan/infinity literal.
> To validate I've written a test that extracts the keywords from the parser 
> tokens and verifies that any non-reserved keywords can be used as table and 
> column names for regular tables and materialized views. It isn't exhaustive 
> but provides a good sense check.



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