tustvold commented on issue #1779:
URL: https://github.com/apache/arrow-rs/issues/1779#issuecomment-1145045156
To add to the confusion `value` and `value_as_string` seem to interpret the
data differently, with value interpreting it inline with the arrow
"specification" and value_as_string doing something different.
```
#[test]
fn test_decimal_array() {
// let val_8887: [u8; 16] = [192, 219, 180, 17, 2, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0];
// let val_neg_8887: [u8; 16] = [64, 36, 75, 238, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255];
let values: [u8; 32] = [
192, 219, 180, 17, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 64, 36, 75,
238, 253,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
];
let array_data = ArrayData::builder(DataType::Decimal(23, 6))
.len(2)
.add_buffer(Buffer::from(&values[..]))
.build()
.unwrap();
let decimal_array = DecimalArray::from(array_data);
assert_eq!(8_887_000_000, decimal_array.value(0));
assert_eq!("8887.000000", decimal_array.value_as_string(0));
assert_eq!(-8_887_000_000, decimal_array.value(1));
assert_eq!(16, decimal_array.value_length());
}
```
Decimal support appears to have been added back in
https://github.com/apache/arrow/pull/8640, perhaps @nevi-me, @alamb or
@jorgecarleitao have some recollection of what is going on here
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