SQL Binding result changed after upgrade to nightly from v8.4.0

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)

1. execute following SQL sentences in v8.4.0
`use test;`
`drop table if exists t;`
`create table t(a int, b int, c int, index idx(a));`
`create global binding for select * from t where a < 1 using select * from t use index(idx) where a < 1;`
`create global binding for select * from t where a < 1 using select * from t ignore index(idx) where a < 1;`

`drop database if exists spm;`
`create database spm;`
`use spm;`
`create global binding for select * from test.t where a <= 1 using select * from test.t use index(idx) where a <= 1;`
`create global binding for select * from test.t where a <= 1 using select * from test.t ignore index(idx) where a <= 1;`
2. upgrade to nightly
3. `show global bindings;`
### 2. What did you expect to see? (Required)

### 3. What did you see instead (Required)

### 4. What is your TiDB version? (Required)

| Release Version: v9.0.0-beta.1.pre-572-g4133e9e
Edition: Community
Git Commit Hash: 4133e9e71a321674de0cbe816cf863cb4886f37e
Git Branch: HEAD
UTC Build Time: 2025-04-15 14:25:48
GoVersion: go1.23.8
Race Enabled: false
Check Table Before Drop: false
Store: tikv |