Sorting Summarized table

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WCi4pSk0tUXBU0lEyMNQ1sNQ1MgYxLaDMWB1UJUYIJWaYSpxA4qZwJYZG2JUYIkwxwmKRM0iJCcIULBaBlBgYI9xigqnEBVkcyVloSgwRnjbE4hZXoLgCGMfGAgA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Street = _t, Begin = _t, End = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Street", type text}, {"Begin", type date}, {"End", type date}},"nl"),
    #"Grouped Rows" = Table.Group(#"Changed Type", {"Street"}, {{"Begin", each List.Min([Begin]), type nullable text}, {"End", each List.Max([End]), type nullable text}}),
    #"Sorted Rows" = Table.Sort(#"Grouped Rows",{{"Begin", Order.Ascending}, {"End", Order.Ascending}, {"Street", Order.Ascending}}),
    #"Added Index" = Table.AddIndexColumn(#"Sorted Rows", "SortOrder", 1, 1, Int64.Type)
in
    #"Added Index"

How to use this code: Create a new Blank Query. Click on "Advanced Editor". Replace the code in the window with the code provided here. Click "Done".

Note:  you haven't indicated how to sort nulls. Solved: Sort text by ascending and make nulls last - Microsoft Fabric Community