DATE_SUB gives wrong result for near zero date

[YangKeao]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

select DATE_SUB('1000-01-01', INTERVAL 1000 YEAR);

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

mysql> select DATE_SUB('1000-01-01', INTERVAL 1000 YEAR);
+--------------------------------------------+
| DATE_SUB('1000-01-01', INTERVAL 1000 YEAR) |
+--------------------------------------------+
| 0000-01-01                                 |
+--------------------------------------------+
1 row in set (0.06 sec)

3. What did you see instead (Required)

mysql> select DATE_SUB('1000-01-01', INTERVAL 1000 YEAR);
+--------------------------------------------+
| DATE_SUB('1000-01-01', INTERVAL 1000 YEAR) |
+--------------------------------------------+
| 0000-00-00                                 |
+--------------------------------------------+
1 row in set (0.00 sec)

4. What is your TiDB version? (Required)