romainfrancois commented on pull request #9615:
URL: https://github.com/apache/arrow/pull/9615#issuecomment-789772368
```cpp
bool CanExtendParallel(SEXP x, const std::shared_ptr<arrow::DataType>& type)
{
// TODO: identify when it's ok to do things in parallel
return false;
}
```
turning this to `true` entirely makes everything fail dramatically. So we'll
need to pay careful attention about what can and cannot be done concurrently.
We might have to dial down the use of the `cpp11` package because I believe
when we create a `cpp11` vector to shell a `SEXP` this uses a central resource
for the protection.
It would probably be better to move the "can this be done in parallel" to a
virtual method of `RConverter`, but we would need to move capture `converter`
in the `task` lambda or at least figure out some way for the converter to still
be alive when the task is run.
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