anchor.diff:  subpartitionDefinition_
       : SUBPARTITION identifier_ partitionDefinitionOption_*
       ;
  +
  +dropTableSpecification_
  +    : TEMPORARY?
  +    ;
  +
  +tableExistClause_
  +    : (IF EXISTS)?
  +    ;
positive.code:     : (UNIQUE | FULLTEXT | SPATIAL)?
      ;
  
  alterClause_
      : alterSpecification_ (COMMA_ alterSpecification_)*
      ;
  
  
negative.code:     ;
  
  alterTable
      : ALTER TABLE tableName alterDefinitionClause_?
      ;
  
  dropTable
      : DROP dropTableSpecification_ TABLE tableExistClause_ tableNames
      ;
  
  dropIndex
  