tristaZero commented on pull request #7340:
URL: https://github.com/apache/shardingsphere/pull/7340#issuecomment-689510804


   @jingshanglu Please give a look at the definition of `createTable`. 
`notExistClause_` is optional, right? 
   > createTable
       : CREATE TEMPORARY? TABLE notExistClause_ tableName 
(createDefinitionClause? tableOptions_? partitionClause? 
duplicateAsQueryExpression? | createLikeClause)
       ;
   
   
   > I think the difference is notExistClause_ is not marked as optional
   > 
   > : CREATE TEMPORARY? TABLE notExistClause_ tableName 
(createDefinitionClause? tableOptions_? partitionClause? 
duplicateAsQueryExpression? | createLikeClause)
   
   


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