presto-parser/src/main/java/io/prestosql/sql/SqlFormatter.java/Formatter/visitAddColumn
class Formatter:        @Override
        protected Void visitAddColumn(AddColumn node, Integer indent)
        {
            builder.append("ALTER TABLE ")
                    .append(node.getName())
                    .append(" ADD COLUMN ")
                    .append(formatColumnDefinition(node.getColumn()));

            return null;
        }