chenkovsky commented on PR #15867:
URL: https://github.com/apache/datafusion/pull/15867#issuecomment-2835208591
I tried to do single thread distinct, but no performance gain.
something like:
```
impl<T> Accumulator for PrimitiveDistinctCountAccumulator<T> {
fn update_batch(&mut self, values: &[ArrayRef]) ->
datafusion_common::Result<()> {
// don't dedup
}
fn merge_batch(&mut self, states: &[ArrayRef]) ->
datafusion_common::Result<()> {
// don't dedup
}
fn evaluate(&mut self) -> datafusion_common::Result<ScalarValue> {
// do dedup
}
}
```
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