Replace non blanks with 1

Hi hdhillon , try this:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WSi/KLy1QMFTSUQJhUwOlWB10QUMDrKLmpmiiRljVGuMUNUIRNYKai2KsEZoTgEwQAjETi1PSYNxYAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Group = _t, Month = _t, Value = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Value", Int64.Type}, {"Month", Int64.Type}}),
    #"Replaced Value" = 
        Table.ReplaceValue(
            #"Changed Type",
            each [Group],
            each
                let
                    varReplacementValue = if Text.Length([Group]) > 0 then "1" else [Group]
                in
            varReplacementValue,
            Replacer.ReplaceText,
            {"Group"}
        )
in
    #"Replaced Value"

It turns this:

Into this:

It looks for any field that has a length greater than 0 and replaces that field with "1" if it does.

How to use M code provided in a blank query:
1) In Power Query, select New Source, then Blank Query
2) On the Home ribbon, select "Advanced Editor" button
3) Remove everything you see, then paste the M code I've given you in that box.
4) Press Done
5) See this article if you need help using this M code in your model.