ianmcook commented on PR #341:
URL: https://github.com/apache/arrow-js/pull/341#issuecomment-4663543386
I think I’m hitting the same underlying issue through `Table.toString()`:
the decimal type and scale are preserved, but stringification prints the raw
unscaled integer:
```js
import { Decimal, makeTable, makeVector } from 'apache-arrow';
const type = new Decimal(2, 5, 128); // scale, precision, bitWidth
// Unscaled integer 1999, representing 19.99 with scale 2.
const price = makeVector({
type,
data: new Uint32Array([1999, 0, 0, 0]),
});
const table = makeTable({ price: price });
console.log(String(price.type));
console.log('value.toString():', String(price.get(0)));
console.log('value.valueOf(scale):', price.get(0).valueOf(type.scale));
console.log(table.toString());
```
Actual output:
```text
Decimal[5e+2]
value.toString(): 1999
value.valueOf(scale): 19.99
[
{"price": 1999}
]
```
Expected: `Table.toString()` would format the decimal using the field type’s
scale, e.g. `19.99`, matching the logical `decimal128(5, 2)` value.
For comparison, PyArrow prints the same logical value using scale metadata:
```python
from decimal import Decimal
import pyarrow as pa
table = pa.table({
"price": pa.array([Decimal("19.99")], type=pa.decimal128(5, 2)),
})
print(table)
```
Output:
```text
pyarrow.Table
price: decimal128(5, 2)
----
price: [[19.99]]
```
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