disable is null predicate constant fold rule for inline view
consider sql
select c.*
from (
select a.*, b.x
from test_insert a left join
(select 'some_const_str' x from test_insert) b on true
) c
where c.x is null;
when push “c.x is null” into c, after folding constant rule, it will get empty result. Because x is 'some_const_str' and "x is null" will be evaluated to false. This is wrong.
0c1458f21f