sweb opened a new pull request #8640:
URL: https://github.com/apache/arrow/pull/8640
This is very much work in progress.
The idea is to implement `DecimalArray` based on the existing
`FixedSizeBinaryArray`. At the current state this is mostly C&P. The values are
returned as `i128`. The underlying fixed size is calculated from the precision.
```
let values: [u8; 20] = [0, 0, 0, 0, 0, 2, 17, 180, 219, 192, 255,
255, 255, 255, 255, 253, 238, 75, 36, 64];
let array_data = ArrayData::builder(DataType::Decimal(23, 6))
.len(2)
.add_buffer(Buffer::from(&values[..]))
.build();
let fixed_size_binary_array = DecimalArray::from(array_data);
assert_eq!(
8_887_000_000,
fixed_size_binary_array.value(0)
);
assert_eq!(
-8_887_000_000,
fixed_size_binary_array.value(1)
);
assert_eq!(10, fixed_size_binary_array.value_length());
```
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