private static TypeInformation <OUT> getWindowFunctionReturnType <IN, OUT, KEY, TW>(
IWindowFunction <IN, OUT, KEY, TW> function,
TypeInformation <IN> inType) where TW : Window
=> TypeExtractor.GetUnaryOperatorReturnType <IN, OUT>(
function,
typeof(IWindowFunction <IN, OUT, KEY, TW>),
0,
1,
new int[] { 3, 0 },
inType,
null,
false);