SelectUtils buildSelectFromTableAndExpressions not contain where clause ？

[numbernumberone]

My needs are as follows

1. before

select * from  tablename where id = 18 and name='$null$'

2. Handling by JSqlParser

some code like
if where clause contians `$null$` value, remove this where expression

3. after

select * from  tablename where id = 18

please help，Thank you very much。