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https://issues.apache.org/jira/browse/HIVE-14872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pengcheng Xiong updated HIVE-14872:
-----------------------------------
    Component/s: Parser

> 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
>          Components: Parser
>    Affects Versions: 2.1.0
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>             Fix For: 2.2.0
>
>         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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