presto-parser/src/main/java/io/prestosql/sql/SqlFormatter.java/Formatter/visitCallArgument
class Formatter:        @Override
        protected Void visitCallArgument(CallArgument node, Integer indent)
        {
            if (node.getName().isPresent()) {
                builder.append(node.getName().get())
                        .append(" => ");
            }
            builder.append(formatExpression(node.getValue()));

            return null;
        }