An incorrect query result only for certain numbers

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)

```SQL
CREATE TABLE t0(c0 float);
INSERT INTO t0 VALUES (642937860);
SELECT t0.c0 FROM t0 WHERE (CASE (CASE NULL WHEN t0.c0 THEN false ELSE 1 END ) WHEN 0 THEN (t0.c0 IS NULL) ELSE t0.c0 END ) REGEXP(0); -- actual:{}, expected:{642937860}
```
### 2. What did you expect to see? (Required)
The SELECT statement returns the value 642937860.
### 3. What did you see instead (Required)
The SELECT statement returns an empty result.
### 4. What is your TiDB version? (Required)

Release Version: v6.6.0
Edition: Community
Git Commit Hash: f4ca0821fb96a2bdd37d2fb97eb26c07fc58d4e4
Git Branch: heads/refs/tags/v6.6.0
UTC Build Time: 2023-02-17 14:49:02
GoVersion: go1.19.5
Race Enabled: false
TiKV Min Version: 6.2.0-alpha
Check Table Before Drop: false
Store: tikv