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From "Pengcheng Xiong (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-14872) Remove the configuration HIVE_SUPPORT_SQL11_RESERVED_KEYWORDS
Date Tue, 11 Oct 2016 21:55:20 GMT

     [ https://issues.apache.org/jira/browse/HIVE-14872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pengcheng Xiong updated HIVE-14872:
-----------------------------------
    Status: Open  (was: Patch Available)

> Remove the configuration HIVE_SUPPORT_SQL11_RESERVED_KEYWORDS
> -------------------------------------------------------------
>
>                 Key: HIVE-14872
>                 URL: https://issues.apache.org/jira/browse/HIVE-14872
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>         Attachments: HIVE-14872.01.patch, HIVE-14872.02.patch
>
>
> The main purpose for the configuration of HIVE_SUPPORT_SQL11_RESERVED_KEYWORDS is for
backward compatibility because a lot of reserved key words has been used as identifiers in
the previous releases. We already have had several releases with this configuration. Now when
I tried to add new set operators to the parser, ANTLR is always complaining "code too large".
I think it is time to remove this configuration. (1) It will simplify the parser logic and
largely reduce the size of generated parser code; (2) it leave space for new features, especially
those which require parser changes.



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