ccxxxyy commented on PR #38074:
URL: https://github.com/apache/shardingsphere/pull/38074#issuecomment-3915632822

   Regarding **UNSET** and **VARIABLE**, [Doris 
](https://doris.apache.org/docs/4.x/sql-manual/basic-element/reserved-keywords) 
does not treat them as reserved keywords. Therefore, I have added them to 
`identifierKeywordsUnambiguous` in `BaseRule.g4`, so that they can be used in 
places where identifiers are expected.
   
   My reasoning is as follows:
   
   The identifier usage chain is:
   
   tableName → name → identifier  
   columnName → identifier
   
   
   and `identifier` includes `identifierKeywordsUnambiguous`.
   
   This means that these keywords can be used as identifiers, such as table 
names, column names, and database names, without requiring quotation marks.


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