branch-2.1: [opt](agg function) Signature verification of aggregate function. #43192
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…0682) Prevent be from crash when Nullable property of aggregate function is changed on FE. Rule: * With group by key: Result type of Aggregate function must be exactly same with type from planner. * Without group by key: If planner gives BE a nullable type, but aggregate function returns a not null type, it is valid. Else, a type mismatch is satisfied, BE will report an exception. Note, for `xxx_foreach`, type check is disabled for now.
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Cherry-picked from #40682