[opt](optimizer) Remove unused code to unify code #38918
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Now, Agg's child predicates will not spread to agg. For example: select a, sum(b) from ( select a,b from t where a = 1 and b = 2 ) t group by a `a = 1` in scan can be propagated to `a` of agg. But `b = 2` in scan can not be propagated to `sum(b)` of agg.
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Proposed changes
Now, Agg's child predicates will not spread to agg.
For example:
select a, sum(b)
from (
select a,b from t where a = 1 and b = 2
) t
group by a
a = 1in scan can be propagated toaof agg.But
b = 2in scan can not be propagated tosum(b)of agg.Issue Number: #38905