[jira] [Updated] (CASSANDRA-16439) Reduce new reserved keywords introduced since 3.0

["Jon Meredith (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-16439?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jon Meredith updated CASSANDRA-16439:
-------------------------------------
    Change Category: Operability
         Complexity: Normal
      Fix Version/s: 4.0-beta
           Assignee: Jon Meredith
             Status: Open  (was: Triage Needed)

> 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
>
>
> 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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