westonpace commented on PR #4640:
URL: https://github.com/apache/arrow-rs/pull/4640#issuecomment-1664611342
This covers the first part of the rules but will quickly reach overflow if
you combine operations without using the second rules to reduce scale:
```
private static Decimal adjustScaleIfNeeded(int precision, int scale) {
if (precision > MAX_PRECISION) {
int minScale = Math.min(scale, MIN_ADJUSTED_SCALE);
int delta = precision - MAX_PRECISION;
precision = MAX_PRECISION;
scale = Math.max(scale - delta, minScale);
}
return new Decimal(precision, scale, 128);
}
```
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