nevi-me commented on pull request #7693:
URL: https://github.com/apache/arrow/pull/7693#issuecomment-656917911
> @nevi-me When I was testing it we weren't seeing it while reading the
record batch back directly; we had to complete the serialization to a byte
stream and then read it back.
Yes, writing to a file stream, and reading that back, works. Try the below:
```rust
#[test]
fn test_arrow_single_float_row() {
let schema = Schema::new(vec![
Field::new("a", DataType::Float32, false),
Field::new("b", DataType::Float32, false),
Field::new("c", DataType::Int32, false),
Field::new("d", DataType::Int32, false),
]);
let arrays = vec![
Arc::new(Float32Array::from(vec![1.23])) as ArrayRef,
Arc::new(Float32Array::from(vec![-6.50])) as ArrayRef,
Arc::new(Int32Array::from(vec![2])) as ArrayRef,
Arc::new(Int32Array::from(vec![1])) as ArrayRef,
];
let batch = RecordBatch::try_new(Arc::new(schema.clone()),
arrays).unwrap();
// create stream writer
let file =
File::create("target/debug/testdata/float.stream").unwrap();
let mut stream_writer = StreamWriter::try_new(file,
&schema).unwrap();
stream_writer.write(&batch).unwrap();
stream_writer.finish().unwrap();
// read stream back
let file = File::open("target/debug/testdata/float.stream").unwrap();
let mut reader = StreamReader::try_new(file).unwrap();
let read_batch = reader.next_batch().unwrap().unwrap();
// TODO: test the output
}
```
I was able to reproduce the 0.0 values without your fix, and the correct
numbers with the fix.
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