rok commented on code in PR #37940:
URL: https://github.com/apache/arrow/pull/37940#discussion_r1340529289
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cpp/src/parquet/encoding.cc:
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@@ -2183,15 +2185,21 @@ class DeltaBitPackEncoder : public EncoderImpl, virtual
public TypedEncoder<DTyp
void FlushBlock();
+ private:
+ constexpr T SafeSubtract(T a, T b) const {
+ constexpr WT mask = static_cast<WT>(static_cast<UT>(static_cast<T>(-1)));
+ return static_cast<T>((static_cast<WT>(a) - static_cast<WT>(b)) & mask);
+ }
Review Comment:
Would this maybe better fit in
[int_util_overflow.h](https://github.com/apache/arrow/blob/main/cpp/src/arrow/util/int_util_overflow.h)?
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