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This can result in a window node that has no\r\nwindow functions at all. We need to drop the window node from the plan so as\r\nnot to repartition the data when we aren't going to do any computation with it.\r\n\r\nSee #5859 \r\n\r\nTesting:\r\n\r\npresto> explain select orderkey from (select sum(orderkey) over(partition by custkey order by orderdate) sok, orderkey from tpch.tiny.orders);\r\n                                          Query Plan                                          \r\n----------------------------------------------------------------------------------------------\r\n - Output[orderkey] => [orderkey:bigint]                                                      \r\n     - RemoteExchange[GATHER] => orderkey:bigint                                              \r\n         - TableScan[tpch:tpch:orders:sf0.01, originalConstraint = true] => [orderkey:bigint] \r\n                 orderkey := tpch:orderkey                                                    \r\n                                                                                           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