ndjson::read::infer does not maintain proper column ordering

[universalmind303]

version: { git = "https://github.com/jorgecarleitao/arrow2", rev = "8604cb760b8ac475d7968b714d47e4ff714c61a1", default-features = false }
rust version:

> rustup show

active toolchain
----------------

nightly-x86_64-unknown-linux-gnu (directory override for '/<redacted>')
rustc 1.64.0-nightly (0f4bcadb4 2022-07-30)

Expected

The ordering of the original Json should be maintained when inferring the datatype.

Actual

The ordering appears to be deterministic, but not in the correct order. Multiple runs of the code seems to always produce [bools, f64, u64, utf8] instead of the expected [u64, f64, utf8, bools]

use arrow2 as arrow;

let mut data: &[u8] = r#"{"u64": 1, "f64": 0.1, "utf8": "foo1", "bools": true}
    {"u64": 2, "f64": 0.2, "utf8": "foo2", "bools": false}
    {"u64": 3, "f64": 0.3, "utf8": "foo3"}
    {"u64": 4, "f64": 0.4, "utf8": "foo4", "bools": false}
    "#
.as_bytes();
let u64_fld = arrow::datatypes::Field::new("u64", arrow::datatypes::DataType::UInt64, true);
let f64_fld = arrow::datatypes::Field::new("f64", arrow::datatypes::DataType::Float64, true);
let utf8_fld = arrow::datatypes::Field::new("utf8", arrow::datatypes::DataType::Utf8, true);
let bools_fld = arrow::datatypes::Field::new("bools", arrow::datatypes::DataType::Boolean, true);

let expected = arrow::datatypes::DataType::Struct(vec![u64_fld, f64_fld, utf8_fld, bools_fld]);
let actual = arrow::io::ndjson::read::infer(&mut data, None).unwrap();

println!("expected={:#?}", expected);
println!("actual={:#?}", actual);
assert_eq!(expected, actual);