pitrou commented on code in PR #43957:
URL: https://github.com/apache/arrow/pull/43957#discussion_r1766941181
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cpp/src/arrow/util/decimal_internal.h:
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@@ -442,8 +516,9 @@ struct RealTraits<float> {
static constexpr float two_to_192(float x) { return x == 0 ? 0 : kFloatInf; }
static constexpr int kMantissaBits = 24;
- // ceil(log10(2 ^ kMantissaBits))
- static constexpr int kMantissaDigits = 8;
+ // log10(2 ^ kMantissaBits) ~= 7.2, let's be conservative to ensure more
accuracy
+ // with our conversions for Decimal values
Review Comment:
As I mentioned elsewhere, float->Decimal32 probably needs to fall back on
the approx algorithm.
I'm a bit surprised for Decimal64, though. Is the RoundedRightShift right?
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