SELECT '2023-03-21 12:00:00' + INTERVAL (1+2)*3 DAY reports "Incorrect parameter count" error

[sleepymole]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

SELECT '2023-03-21 12:00:00' + INTERVAL (1+2)*3 DAY;

2. What did you expect to see? (Required)

mysql> SELECT '2023-03-21 12:00:00' + INTERVAL (1+2)*3 DAY;
+----------------------------------------------+
| '2023-03-21 12:00:00' + INTERVAL (1+2)*3 DAY |
+----------------------------------------------+
| 2023-03-30 12:00:00                          |
+----------------------------------------------+
1 row in set (0.00 sec)

3. What did you see instead (Required)

mysql> SELECT '2023-03-21 12:00:00' + INTERVAL (1+2)*3 DAY;
ERROR 1582 (42000): Incorrect parameter count in the call to native function 'interval'

This query is ok on MySQL 5.7.

mysql> SELECT version();
+------------+
| version()  |
+------------+
| 5.7.41-log |
+------------+
1 row in set (0.00 sec)

mysql> SELECT '2023-03-21 12:00:00' + INTERVAL (1+2)*3 DAY;
+----------------------------------------------+
| '2023-03-21 12:00:00' + INTERVAL (1+2)*3 DAY |
+----------------------------------------------+
| 2023-03-30 12:00:00                          |
+----------------------------------------------+
1 row in set (0.00 sec)

4. What is your TiDB version? (Required)

+--------------------+
| version()          |
+--------------------+
| 5.7.25-TiDB-v6.6.0 |
+--------------------+

[windtalker]

I think it is a parser problem, in
SELECT '2023-03-21 12:00:00' + INTERVAL (1+2)*3 DAY;
The parser actually interpret INTERVAL(1+2) as a function, so it throws error.