Github user maropu commented on the issue:
https://github.com/apache/spark/pull/17191
@cloud-fan In the mixed case, it seems PotgreSQL and MySQL support the
syntax;
```
// PostgreSQL v9.5
postgres=# \d t2
Table "public.t2"
Column | Type | Modifiers
--------+---------+-----------
gkey1 | integer |
gkey2 | integer |
value | integer |
postgres=# select gkey1 AS key1, gkey2, count(value) from t2 group by key1,
2;
key1 | gkey2 | count
------+-------+-------
1 | 1 | 1
(1 row)
// MySQL v5.7.13
mysql> SHOW COLUMNS FROM t2;
+-------+---------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+---------+------+-----+---------+-------+
| gkey1 | int(11) | YES | | NULL | |
| gkey2 | int(11) | YES | | NULL | |
| value | int(11) | YES | | NULL | |
+-------+---------+------+-----+---------+-------+
3 rows in set (0.00 sec)
mysql> select gkey1 AS key1, gkey2, count(value) from t2 group by key1, 2;
+------+-------+--------------+
| key1 | gkey2 | count(value) |
+------+-------+--------------+
| 1 | 1 | 1 |
+------+-------+--------------+
1 row in set (0.00 sec)
```
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