Incorrect query result

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)

```sql
CREATE TABLE t1 (c1 VARCHAR(50) NOT NULL);
INSERT INTO t1 (c1) VALUES ('0');
SELECT c1 as r2 FROM t1 WHERE FROM_DAYS(0) NOT IN (SELECT c1 FROM t1); -- actual: {0}， expected: {}
```
### 2. What did you expect to see? (Required)
{} is expected to return.
### 3. What did you see instead (Required)
{0} is returned.
### 4. What is your TiDB version? (Required)

Release Version: v8.5.1
Edition: Community
Git Commit Hash: fea86c8e35ad4a86a5e1160701f99493c2ee547c
Git Branch: HEAD
UTC Build Time: 2025-01-16 07:38:34
GoVersion: go1.23.4
Race Enabled: false
Check Table Before Drop: false
Store: tikv