[Bug]: fulltext index performance is slow

[tom-csf]

Is there an existing issue for the same bug?

• [X] I have checked the existing issues.

Branch Name

2.0-dev

Commit ID

3fced2dccf3763254979dd9f196e3896d97aa322

Other Environment Information

- Hardware parameters:
- OS type:
- Others:

Actual Behavior

Expected Behavior

No response

Steps to Reproduce

1、load 1g tpch to database
2、set experimental_fulltext_index=1;
   create fulltext index fdx1 on lineitem(L_COMMENT);
3、select * from lineitem where match(l_comment) against ('"e the furiously express accounts are at the"' in boolean mode);
4、select * from lineitem where l_comment = 'e the furiously express accounts are at the';

Additional information