mingmwang commented on PR #6045:
URL:
https://github.com/apache/arrow-datafusion/pull/6045#issuecomment-1513390720
I'm afraid the current approach will not work in below case, additional Hash
Repartition will still be added:
```sql
select count(*) from {
select distinct name from table t1
union all
select distinct name from table t2
) group by name
```
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