[GitHub] [arrow] pitrou commented on a change in pull request #10823: ARROW-9948: [C++] Fix scale handling in Decimal128::FromString

[GitBox <gi...@apache.org>]

pitrou commented on a change in pull request #10823:
URL: https://github.com/apache/arrow/pull/10823#discussion_r678899547



##########
File path: cpp/src/arrow/util/decimal.cc
##########
@@ -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:
       Precision is computed as the number of significant digits. I think it's ok (it was also the intent of the code previously).




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