pitrou commented on code in PR #48217:
URL: https://github.com/apache/arrow/pull/48217#discussion_r3348670962
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cpp/src/arrow/util/byte_stream_split_internal.h:
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@@ -330,15 +330,20 @@ inline void DoSplitStreams(const uint8_t* src, int width,
int64_t nvalues,
while (nvalues >= kBlockSize) {
for (int stream = 0; stream < width; ++stream) {
uint8_t* dest = dest_streams[stream];
+#if ARROW_LITTLE_ENDIAN
+ const int src_stream = stream;
+#else
+ const int src_stream = width - 1 - stream;
+#endif
Review Comment:
Well, I don't understand why this change is necessary? Can you explain
(preferably by showing example input/outputs)?
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