anchor.diff:  newTableName
       : IDENTIFIER_
       ;
  -
  -usingIndexType
  -    : USING (BTREE | HASH | GIST | SPGIST | GIN | BRIN)
  -    ;
  -
  -excludeElement
  -    : (columnName | expr) ignoredIdentifier_? (ASC | DESC)? (NULLS (FIRST | LAST))?
  -    ;
  
positive.code:     | REPLICA IDENTITY (DEFAULT | (USING INDEX indexName) | FULL | NOTHING)
      ;
  
  tableConstraintUsingIndex
      : (CONSTRAINT ignoredIdentifier_)? (UNIQUE | primaryKey) USING INDEX indexName constraintOptionalParam
      ;
  
  addColumnSpecification
      : ADD COLUMN? (IF NOT EXISTS)? columnDefinition
      ;
  
negative.code:     ;
  
  alterTable
      : ALTER TABLE tableExistClause_ onlyClause_ tableName asteriskClause_ alterClause_
      ;
  
  alterIndex
  