anchor.diff:      ;
   
   dropIndex
  -    : DROP INDEX dropIndexSpecification_ indexName ON tableName
  +    : DROP INDEX dropIndexSpecification_? indexName (ON tableName)?
       ;
   
   truncateTable
  
positive.code: import Symbol, Keyword, MySQLKeyword, Literals, BaseRule;
  
  createTable
      : CREATE createTableSpecification_ TABLE tableNotExistClause_ tableName (createDefinitionClause_ | createLikeClause_)
      ;
  
  createIndex
  
negative.code:     ;
  
  createTableSpecification_
      : TEMPORARY
      ;
  
  tableNotExistClause_
  