`TIMESTAMP` should return `NULL` for zero time
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Description
## Bug Report
Please answer these questions before submitting your issue. Thanks!
### 1. Minimal reproduce step (Required)
### 2. What did you expect to see? (Required)
```
mysql> SELECT TIMESTAMP('0000-00-00 00:00:00');
+----------------------------------+
| TIMESTAMP('0000-00-00 00:00:00') |
+----------------------------------+
| NULL |
+----------------------------------+
1 row in set, 1 warning (0.02 sec)
```
### 3. What did you see instead (Required)
```
mysql> SELECT TIMESTAMP('0000-00-00 00:00:00');
+----------------------------------+
| TIMESTAMP('0000-00-00 00:00:00') |
+----------------------------------+
| 0000-00-00 00:00:00 |
+----------------------------------+
1 row in set (0.00 sec)
```
### 4. What is your TiDB version? (Required)
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