pitrou commented on code in PR #48203:
URL: https://github.com/apache/arrow/pull/48203#discussion_r2556408154
##########
cpp/src/parquet/decoder.cc:
##########
@@ -458,7 +470,24 @@ inline int DecodePlain(const uint8_t* data, int64_t
data_size, int num_values,
}
// If bytes_to_decode == 0, data could be null
if (bytes_to_decode > 0) {
+#if ARROW_LITTLE_ENDIAN
memcpy(out, data, static_cast<size_t>(bytes_to_decode));
+#else
+ // On big-endian systems, we need to byte-swap each value
+ // since Parquet data is stored in little-endian format.
+ // Only apply to integer and floating-point types that have
FromLittleEndian support.
+ if constexpr (std::is_same_v<T, int32_t> || std::is_same_v<T, uint32_t> ||
+ std::is_same_v<T, int64_t> || std::is_same_v<T, uint64_t> ||
+ std::is_same_v<T, float> || std::is_same_v<T, double>) {
Review Comment:
I think we should be a bit more future-proof and write something like:
```suggestion
if constexpr (std::is_arithmetic_v<T>) {
```
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