kiszk commented on a change in pull request #8955:
URL: https://github.com/apache/arrow/pull/8955#discussion_r546328882
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File path: cpp/src/arrow/util/basic_decimal.cc
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@@ -949,33 +949,31 @@ DecimalStatus BasicDecimal128::Rescale(int32_t
original_scale, int32_t new_scale
void BasicDecimal128::GetWholeAndFraction(int scale, BasicDecimal128* whole,
BasicDecimal128* fraction) const {
- DCHECK_GE(scale, 0);
- DCHECK_LE(scale, 38);
+ DCHECK_EQ(ValidateScale(scale), true);
BasicDecimal128 multiplier(ScaleMultipliers[scale]);
auto s = Divide(multiplier, whole, fraction);
DCHECK_EQ(s, DecimalStatus::kSuccess);
}
+bool BasicDecimal128::ValidateScale(int32_t scale) { return (std::abs(scale)
<= 38); }
Review comment:
This function can accept `-38 <= scale <= 38` while the original code
accepted `0 <= scale <= 38`.
Is this change expected? If so, it would be good to leave a comment.
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