alamb commented on issue #5472:
URL:
https://github.com/apache/arrow-datafusion/issues/5472#issuecomment-1638619181
I was thinking something like the following (templated on primitive type):
```rust
struct CountDistinctGroupsAccumulator<T: ArrowPrimitiveType> {
values: HashSet<T>,
}
```
Then use `DataType::List` as we do today to pass intermediate state
> Also there are probably more opportunities to rewrite queries (i.e.
rewrite select distinct + join on the group by keys might work faster in some
cases).
that is also quite interesting
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