Enable two phase partition topn optimization, instead of original full sort at the second phase.
E.g, partial plan of tpcds q67 is as following and a full sort after exchange will have performance impact, especially if the window column's ndv is very high and the number of window is huge.
------PhysicalTopN
--------filter((rk <= 100))
----------PhysicalWindow
------------PhysicalQuickSort
--------------PhysicalDistribute
----------------PhysicalPartitionTopN
------------------PhysicalProject
Under this scenario, the second phase full sort can be transformed to a global PhysicalPartitionTopN and reduce the cost from full sort. The plan will be optimized to the following:
------PhysicalTopN
--------filter((rk <= 100))
----------PhysicalWindow
------------PhysicalPartitionTopN
--------------PhysicalDistribute
----------------PhysicalPartitionTopN
------------------PhysicalProject
00bb32cfc0