romainfrancois commented on pull request #9615:
URL: https://github.com/apache/arrow/pull/9615#issuecomment-845206073
After all the `DelayedExtend()` are finished, i.e. after the `status &=
tasks.Finish();` thing, there is still work to do to actually create the
arrays:
```cpp
for (int j = 0; j < num_fields; j++) {
auto& converter = converters[j];
if (converter != nullptr) {
auto maybe_array = converter->ToArray();
StopIfNotOk(maybe_array.status());
columns[j] =
std::make_shared<arrow::ChunkedArray>(maybe_array.ValueUnsafe());
}
}
```
I don't think there's any R involved there, so I suppose this could be done
in parallel, with some care about the `StopIfNotOk()` ...
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