[GitHub] [arrow] emkornfield commented on a change in pull request #10823: ARROW-9948: [C++] Fix scale handling in Decimal{128, 256}::FromString

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

emkornfield commented on a change in pull request #10823:
URL: https://github.com/apache/arrow/pull/10823#discussion_r679531328



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File path: cpp/src/arrow/util/decimal.cc
##########
@@ -528,29 +527,33 @@ 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());
   } else {
     parsed_scale = static_cast<int32_t>(dec.fractional_digits.size());
   }
 
   if (out != nullptr) {
-    std::array<uint64_t, 2> little_endian_array = {0, 0};
+    static_assert(Decimal::kBitWidth % 64 == 0, "decimal bit-width not a multiple of 64");
+    std::array<uint64_t, Decimal::kBitWidth / 64> little_endian_array = {0, 0};

Review comment:
       I think just {0} works here?




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