cloud-fan commented on pull request #28717:
URL: https://github.com/apache/spark/pull/28717#issuecomment-638591182
```
sql("select * from (select t1.a, t1.b from t t1 join t t2 on t1.a = t2.a
group by t1.a, t1.b) j join t t3 where j.b = t3.b").show
```
This also works. Please let me know if I miss something, thanks!
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