presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/GatherAndMergeWindows.java/GatherAndMergeWindows/MergeAdjacentWindowsOverProjects
class GatherAndMergeWindows:        public MergeAdjacentWindowsOverProjects(int numProjects)
        {
            super(numProjects);
        }