AlenkaF commented on issue #11799:
URL: https://github.com/apache/arrow/issues/11799#issuecomment-983379697
What I mean is that it should work in C++ also if not called directly. Here
I am not of much help but would maybe try with something like:
```
arrow::compute::CountOptions all(arrow::compute::CountOptions::ALL);
auto res =
arrow::compute::internal::GroupBy({array}, {arrayKey}, {{"hash_count",
&all}}, false);
```
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