bkietz commented on a change in pull request #10823:
URL: https://github.com/apache/arrow/pull/10823#discussion_r679930351
##########
File path: cpp/src/arrow/util/basic_decimal.h
##########
@@ -54,6 +61,20 @@ class ARROW_EXPORT BasicDecimal128 {
: high_bits_(high), low_bits_(low) {}
#endif
+ /// \brief Create a BasicDecimal256 from the two's complement representation.
+ /// Input array is assumed to be in native endianness.
+#if ARROW_LITTLE_ENDIAN
+ constexpr BasicDecimal128(const std::array<uint64_t, 2>& array) noexcept
+ : low_bits_(array[0]), high_bits_(static_cast<int64_t>(array[1])) {}
+#else
+ constexpr BasicDecimal128(const std::array<uint64_t, 2>& array) noexcept
+ : high_bits_(static_cast<int64_t>(array[0])), low_bits_(array[1]) {}
+#endif
+
+ // XXX
+ BasicDecimal128(LittleEndianArrayTag, const std::array<uint64_t, 2>& array)
noexcept
+ : BasicDecimal128(BitUtil::LittleEndianArray::ToNative(array)) {}
Review comment:
I'd say it's not idiomatic arrow; I'd expect something like:
```suggestion
static BasicDecimal128 FromLittleEndianArray(const std::array<uint64_t,
2>& array) noexcept {
return {BitUtil::LittleEndianArray::ToNative(array)};
}
```
... but then we'll have to repeat the declaration for non Basic decimal
types.
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