Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/14786
MySQL and PostgreSQL support this
**MySQL**
- Greatest/leastest
```sql
mysql> SELECT GREATEST(CAST("1990-02-24 12:00:00" AS DATETIME),
CAST("1990-02-25" AS DATE));
+-------------------------------------------------------------------------------+
| GREATEST(CAST("1990-02-24 12:00:00" AS DATETIME), CAST("1990-02-25" AS
DATE)) |
+-------------------------------------------------------------------------------+
| 1990-02-25 00:00:00
|
+-------------------------------------------------------------------------------+
```
- Union
```sql
mysql> SELECT CAST("1990-02-24 12:00:00" AS DATETIME) UNION SELECT
CAST("1990-02-24" AS DATE);
+-----------------------------------------+
| CAST("1990-02-24 12:00:00" AS DATETIME) |
+-----------------------------------------+
| 1990-02-24 12:00:00 |
| 1990-02-24 00:00:00 |
+-----------------------------------------+
```
**PostgreSQL**
- Greatest/leatest
```sql
postgres=# SELECT GREATEST(CAST('1990-02-24 12:00:00' AS TIMESTAMP),
CAST('1990-02-25' AS DATE));
greatest
---------------------
1990-02-25 00:00:00
(1 row)
```
- Union
```sql
postgres=# SELECT CAST('1990-02-24 12:00:00' AS TIMESTAMP) UNION SELECT
CAST('1990-02-24' AS DATE);
timestamp
---------------------
1990-02-24 00:00:00
1990-02-24 12:00:00
(2 rows)
```
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