zeroshade commented on pull request #10116:
URL: https://github.com/apache/arrow/pull/10116#issuecomment-825744440
the slight changes in the updated commits significantly improve the
performance which can be seen by the benchmarks.
Before:
```
goos: windows
goarch: amd64
pkg: github.com/apache/arrow/go/arrow/decimal128
cpu: Intel(R) Core(TM) i7-8850H CPU @ 2.60GHz
BenchmarkBigIntToDecimal-12 20276983 58.21 ns/op
48 B/op 1 allocs/op
BenchmarkDecimalToBigInt-12 8945876 141.2 ns/op
112 B/op 4 allocs/op
PASS
ok github.com/apache/arrow/go/arrow/decimal128 2.839s
```
After:
```
goos: windows
goarch: amd64
pkg: github.com/apache/arrow/go/arrow/decimal128
cpu: Intel(R) Core(TM) i7-8850H CPU @ 2.60GHz
BenchmarkBigIntToDecimal-12 262177144 4.549 ns/op
0 B/op 0 allocs/op
BenchmarkDecimalToBigInt-12 21051966 58.65 ns/op
48 B/op 2 allocs/op
PASS
ok github.com/apache/arrow/go/arrow/decimal128 3.045s
```
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