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# Proposed changes 1.The new optimizer supports the combination of subquery and disjunction.In the way of MarkJoin, it behaves the same as the old optimizer. For design details see:https://emmymiao87.github.io/jekyll/update/2021/07/25/Mark-Join.html. 2.Implicit type conversion is performed when conjects are generated after subquery parsing 3.Convert the unnesting of scalarSubquery in filter from filter+join to join + Conjuncts.