presto-parser/src/main/java/io/prestosql/sql/SqlFormatter.java/Formatter/visitUnnest
class Formatter:        @Override
        protected Void visitUnnest(Unnest node, Integer indent)
        {
            builder.append("UNNEST(")
                    .append(node.getExpressions().stream()
                            .map(ExpressionFormatter::formatExpression)
                            .collect(joining(", ")))
                    .append(")");
            if (node.isWithOrdinality()) {
                builder.append(" WITH ORDINALITY");
            }
            return null;
        }