Methods and systems for integrating use of materialized transient views into generation of an optimized query execution plan. Features and aspects hereof provide rapid identification of common expressions in a query as transient view candidates and then rapidly select among the transient view candidates for those transient views that most benefit the cost of execution of the query. The selected transient views are incorporated into a generated final, optimized query execution plan including operator to materialize the selected transient views for re-use in execution of the query.