[fix](sort)the sort expr's nullability property may not be right #13328
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Proposed changes
Issue Number: close #xxx
Problem summary
the sort exprs nullability property may not be right after subsitute using child's smap info. this pr is a bottom line solution to make be works even the nullability info is wrong. The nereids optimizer should fix this totally
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Further comments
If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...