cyb70289 commented on a change in pull request #10928:
URL: https://github.com/apache/arrow/pull/10928#discussion_r689211555
##########
File path: cpp/src/arrow/util/basic_decimal.h
##########
@@ -388,6 +399,31 @@ class ARROW_EXPORT BasicDecimal256 {
/// \brief In-place division.
BasicDecimal256& operator/=(const BasicDecimal256& right);
+ /// \brief Get the maximum decimal value (is not a valid value).
+ static inline constexpr BasicDecimal256 GetMaxSentinel() {
+#if ARROW_LITTLE_ENDIAN
+ return BasicDecimal256({std::numeric_limits<uint64_t>::max(),
+ std::numeric_limits<uint64_t>::max(),
+ std::numeric_limits<uint64_t>::max(),
+
static_cast<uint64_t>(std::numeric_limits<int64_t>::max())});
+#else
+ return
BasicDecimal256({static_cast<uint64_t>(std::numeric_limits<int64_t>::max()),
+ std::numeric_limits<uint64_t>::max(),
+ std::numeric_limits<uint64_t>::max(),
+ std::numeric_limits<uint64_t>::max()});
+#endif
Review comment:
Or maybe `(BasicDecimal256(1) << 255) - 1`? cc @pitrou
##########
File path: cpp/src/arrow/util/basic_decimal.h
##########
@@ -388,6 +399,31 @@ class ARROW_EXPORT BasicDecimal256 {
/// \brief In-place division.
BasicDecimal256& operator/=(const BasicDecimal256& right);
+ /// \brief Get the maximum decimal value (is not a valid value).
+ static inline constexpr BasicDecimal256 GetMaxSentinel() {
+#if ARROW_LITTLE_ENDIAN
+ return BasicDecimal256({std::numeric_limits<uint64_t>::max(),
+ std::numeric_limits<uint64_t>::max(),
+ std::numeric_limits<uint64_t>::max(),
+
static_cast<uint64_t>(std::numeric_limits<int64_t>::max())});
+#else
+ return
BasicDecimal256({static_cast<uint64_t>(std::numeric_limits<int64_t>::max()),
+ std::numeric_limits<uint64_t>::max(),
+ std::numeric_limits<uint64_t>::max(),
+ std::numeric_limits<uint64_t>::max()});
+#endif
Review comment:
Can be simplified as
`return BasicDecimal256(BitUtil::LittleEndianArray::ToNative<uint64_t,
4>({little-endian-array-0,1,2,3})`
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