stenlarsson opened a new issue, #41364:
URL: https://github.com/apache/arrow/issues/41364
### Describe the enhancement requested
The aggregators `first` and `last` are unusable in Ruby because they don't
work when the execution plan is executed using threads:
```ruby
require 'arrow'
table = Arrow::Table.new(
'foo' => [1, 1],
'bar' => ['first', 'second'],
)
pp table.group('foo').aggregate('first(bar)')
```
Executing this script results in:
```
[execute-plan][build-node]: NotImplemented: Using ordered aggregator in
multiple threaded execution is not supported (Arrow::Error::NotImplemented)
```
This seems like the same issue that was fixed for Python in
https://github.com/apache/arrow/pull/36768, and similar solution is needed for
Ruby.
### Component(s)
Ruby
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