Github user maropu commented on the issue:
https://github.com/apache/spark/pull/17191
You mean this case?
```
postgres=# select gkey1 AS k1, gkey2 AS k2, count(value) AS k1 from t2
group by k1, k2;
ERROR: GROUP BY "k1" is ambiguous
LINE 1: ...k1, gkey2 AS k2, count(value) AS k1 from t2 group by k1, k2;
```
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