chenkovsky commented on PR #15867:
URL: https://github.com/apache/datafusion/pull/15867#issuecomment-2834018098
I tested shared concurrent hashset(DashSet) to avoid clone, but no
performance gain.
something like
```rust
static global_values: LazyLock<DashSet<i64, std::hash::RandomState>> =
LazyLock::new(|| DashSet::new());
#[derive(Debug)]
pub struct PrimitiveDistinctCountAccumulatorI64
{
data_type: DataType,
values: &'static DashSet<i64, std::hash::RandomState>
}
impl PrimitiveDistinctCountAccumulatorI64
{
pub fn new(data_type: &DataType) -> Self {
Self {
values: &global_values,
data_type: data_type.clone(),
}
}
}
```
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