alamb commented on code in PR #15099:
URL: https://github.com/apache/datafusion/pull/15099#discussion_r1988994922
##########
datafusion/optimizer/src/optimizer.rs:
##########
@@ -240,7 +239,6 @@ impl Optimizer {
// Filters can't be pushed down past Limits, we should do
PushDownFilter after PushDownLimit
Arc::new(PushDownLimit::new()),
Arc::new(PushDownFilter::new()),
- Arc::new(SingleDistinctToGroupBy::new()),
Review Comment:
The alternative would be to directly implement distinct support in the avg
accumulator
The lack of avg support means we can't run multiple distinct avg aggregates
```sql
> select avg(distinct a), avg(distinct b) from values(1, 2) t(a, b);
Execution error: avg(DISTINCT) aggregations are not available
```
This is tracked by
- https://github.com/apache/datafusion/issues/2408
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