neilconway opened a new issue, #10872:
URL: https://github.com/apache/arrow-rs/issues/10872
### Describe the bug
`array_from_json` in arrow-integration-test decodes a Decimal256 `0`
incorrectly. It builds a little-endian two's-complement buffer for the value,
which requires sign-extension fill bytes, but uses `0xFF` rather than `0x00`
fill for a `0` input value.
### To Reproduce
```rust
use arrow::array::AsArray;
use arrow::datatypes::{DataType, Decimal256Type, Field};
use arrow_integration_test::{array_from_json, ArrowJsonColumn};
let field = Field::new("c", DataType::Decimal256(76, 0), false);
let col: ArrowJsonColumn = serde_json::from_str(
r#"{"name": "c", "count": 3, "VALIDITY": [1, 1, 1], "DATA": ["0", "1",
"-1"]}"#,
)
.unwrap();
let arr = array_from_json(&field, col, None).unwrap();
let arr = arr.as_primitive::<Decimal256Type>();
arr.value(0); // -256 — expected 0
arr.value(1); // 1, correct
arr.value(2); // -1, correct
```
### Expected behavior
_No response_
### Additional context
_No response_
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