comphead opened a new issue, #4577:
URL: https://github.com/apache/arrow-rs/issues/4577
**Describe the bug**
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A clear and concise description of what the bug is.
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CAST f64 to Decimals gives incorrect result
**To Reproduce**
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Steps to reproduce the behavior:
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Both Decimal128, Decimal256 are wrong
```
#[test]
fn test_cast() {
let array =
Float64Array::from(vec![6.4053151420411946063694043751862251568]);
let array = Arc::new(array) as ArrayRef;
let casted_array = cast_with_options(
&array,
&DataType::Decimal256(38, 37),
&CastOptions {
safe: true,
format_options: FormatOptions::default(),
},
).unwrap();
let casted_array = casted_array.as_primitive::<Decimal256Type>();
assert_eq!(casted_array.value_as_string(0),
"6.4053151420411946063694043751862251568");
}
```
**Expected behavior**
<!--
A clear and concise description of what you expected to happen.
-->
**Additional context**
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-->
Found on https://github.com/apache/arrow-datafusion/issues/7121
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