pitrou commented on code in PR #48207:
URL: https://github.com/apache/arrow/pull/48207#discussion_r2556381609


##########
cpp/src/parquet/statistics.cc:
##########
@@ -925,22 +926,94 @@ void TypedStatisticsImpl<DType>::UpdateSpaced(const T* 
values, const uint8_t* va
 
 template <typename DType>
 void TypedStatisticsImpl<DType>::PlainEncode(const T& src, std::string* dst) 
const {
+#if ARROW_LITTLE_ENDIAN
   auto encoder = MakeTypedEncoder<DType>(Encoding::PLAIN, false, descr_, 
pool_);
   encoder->Put(&src, 1);

Review Comment:
   Why not call `ToLittleEndian` here? The added code below seems overly 
complicated and it's not obvious why it should be behind a `#if` guard.



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