anchor.diff:  inheritClause_
       : (INHERITS tableNames)?
       ;
  +
  +createIndexSpecification_
  +    : UNIQUE? INDEX CONCURRENTLY?
  +    ;
  +
  +indexNotExistClause_
  +    : (IF NOT EXISTS)?
  +    ;
  +
  +
  +
  +
  +
  +
   
   alterIndexName
       : ALTER INDEX (IF EXISTS)? indexName
  
positive.code: import Symbol, Keyword, Literals, BaseRule;
  
  createTable
      : CREATE createSpecification_ TABLE notExistClause_ tableName createDefinitionClause_ inheritClause_
      ;
  
  createIndex
      : CREATE UNIQUE? INDEX CONCURRENTLY? ((IF NOT EXISTS)? indexName)? ON tableName 
      ;
  
  alterTable
  
negative.code:     : TRUNCATE TABLE? ONLY? tableNameParts
      ;
  
  createTableSpecification_
      : ((GLOBAL | LOCAL)? (TEMPORARY | TEMP) | UNLOGGED)?
      ;
  
  