maropu commented on pull request #30144:
URL: https://github.com/apache/spark/pull/30144#issuecomment-716353950
I'm not familiar with this mixed case, so I just want to know a whole
picture of this feature first. The other systems support this feature? And, how
about the other mixed cases as follows?
```
postgres=# create table t(a int, b int, c int, v int);
postgres=# insert into t values (1, 1, 1, 1);
postgres=# select a, b, c, sum(v) from t group by rollup(a, b), cube(b, c);
a | b | c | sum
---+---+---+-----
| | | 1
1 | | 1 | 1
1 | | | 1
1 | 1 | 1 | 1
1 | 1 | 1 | 1
1 | 1 | 1 | 1
| 1 | 1 | 1
| | 1 | 1
1 | 1 | | 1
1 | 1 | | 1
1 | 1 | | 1
| 1 | | 1
(12 rows)
postgres=# select a, b, c, sum(v) from t group by rollup(a, b), cube(b, c),
grouping sets(a, c);
a | b | c | sum
---+---+---+-----
1 | 1 | | 1
1 | 1 | | 1
1 | 1 | | 1
1 | 1 | | 1
1 | | | 1
1 | | | 1
1 | 1 | 1 | 1
1 | 1 | 1 | 1
1 | 1 | 1 | 1
1 | 1 | 1 | 1
1 | 1 | 1 | 1
1 | 1 | 1 | 1
1 | 1 | 1 | 1
1 | 1 | 1 | 1
1 | 1 | 1 | 1
1 | 1 | 1 | 1
| 1 | 1 | 1
| 1 | 1 | 1
| | 1 | 1
| | 1 | 1
1 | | 1 | 1
1 | | 1 | 1
1 | | 1 | 1
1 | | 1 | 1
(24 rows)
```
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