Expressiveness for queries

General Usage Performance
2

Note, you are not using DataFramesMeta.jl here, but rather Query.jl. DataFramesMeta.jl works more similar to how you describe

julia> using DataFramesMeta

julia> df = DataFrame(FR = [1, 2, 3], SCS_kHz = [4, 5, 6], bw = [7, 8, 9]);


julia> fr = 1; scs = 4; bw = 7;

julia> @rsubset(df, :FR == fr, :SCS_kHz == scs, :bw == bw)
1×3 DataFrame
 Row │ FR     SCS_kHz  bw    
     │ Int64  Int64    Int64 
─────┼───────────────────────
   1 │     1        4      7

But I think you are saying you want to store the query. This is a good feature request and is tracked in DataFramesMeta.jl here.

It would be great to get a PR together to work on this.

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