Well, I guess I'll have to play with it. It's not entirely clear from the release notes what "semantics" means in this case. In principle in relational algebr

Well, I guess I'll have to play with it. It's not entirely clear from the release notes what "semantics" means in this case. In principle in relational algebra ORDER BY is simply not meaningful because it's all unordered sets. In practice ORDER BY is essential. In principle all ORDER BY clauses in sub-queries can just be deleted, but in practice it can affect aggregation functions not built on commutative operations.