presto-parser/src/main/java/io/prestosql/sql/SqlFormatter.java/SqlFormatter/formatColumnDefinition
class SqlFormatter:        private String formatColumnDefinition(ColumnDefinition column)
        {
            StringBuilder sb = new StringBuilder()
                    .append(formatExpression(column.getName()))
                    .append(" ").append(column.getType());
            if (!column.isNullable()) {
                sb.append(" NOT NULL");
            }
            column.getComment().ifPresent(comment ->
                    sb.append(" COMMENT ").append(formatStringLiteral(comment)));
            sb.append(formatPropertiesSingleLine(column.getProperties()));
            return sb.toString();
        }