zanmato1984 commented on code in PR #39383:
URL: https://github.com/apache/arrow/pull/39383#discussion_r1456158094
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cpp/src/arrow/compute/light_array.cc:
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@@ -575,18 +576,26 @@ Status ExecBatchBuilder::AppendSelected(const
std::shared_ptr<ArrayData>& source
// Step 1: calculate target offsets
//
- uint32_t* offsets = reinterpret_cast<uint32_t*>(target->mutable_data(1));
- uint32_t sum = num_rows_before == 0 ? 0 : offsets[num_rows_before];
- Visit(source, num_rows_to_append, row_ids,
- [&](int i, const uint8_t* ptr, uint32_t num_bytes) {
- offsets[num_rows_before + i] = num_bytes;
- });
- for (int i = 0; i < num_rows_to_append; ++i) {
- uint32_t length = offsets[num_rows_before + i];
- offsets[num_rows_before + i] = sum;
- sum += length;
+ int32_t* offsets = reinterpret_cast<int32_t*>(target->mutable_data(1));
+ {
Review Comment:
Not any substantial reason. Just to hide `sum` from below to make the
following code easier to read. Perhaps it unexpectedly brings more confusion
than ease...
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