cyb70289 commented on a change in pull request #10823:
URL: https://github.com/apache/arrow/pull/10823#discussion_r678793225
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File path: cpp/src/arrow/util/decimal.cc
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@@ -528,8 +528,8 @@ Status Decimal128::FromString(const util::string_view& s,
Decimal128* out,
int32_t parsed_scale = 0;
if (dec.has_exponent) {
auto adjusted_exponent = dec.exponent;
- auto len = static_cast<int32_t>(significant_digits);
- parsed_scale = -adjusted_exponent + len - 1;
+ parsed_scale =
+ -adjusted_exponent +
static_cast<int32_t>(dec.fractional_digits.size());
Review comment:
For `12.34e-3`, old code calcs scale = 6, now it's 5. I think 5 is
correct.
Just curious, looks the final precision = 4 < scale = 6, is it okay?
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