Dandandan opened a new issue, #5143:
URL: https://github.com/apache/arrow-datafusion/issues/5143
**Describe the bug**
e.g the `multiply_decimal`
```
pub(crate) fn multiply_decimal(
left: &Decimal128Array,
right: &Decimal128Array,
) -> Result<Decimal128Array> {
let divide = 10_i128.pow(left.scale() as u32);
let array = multiply(left, right)?;
let array = divide_scalar(&array, divide)?
.with_precision_and_scale(left.precision(), left.scale())?;
Ok(array)
}
```
Loses information, as integer division is used instead of increasing the
precision / scale.
The same applies for addition as well.
**To Reproduce**
Steps to reproduce the behavior:
**Expected behavior**
A clear and concise description of what you expected to happen.
**Additional context**
Add any other context about the problem here.
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