Create a new column that has a list of items of a second column, with a condition from a third column

New to Julia
2

I don’t understand what the actual transformation you are trying to do is, but here is an answer using DataFramesMeta.jl

julia> t = @rtransform df :x1 = begin 
           better_than = :score .> (:sum .+ 1)
           :score[better_than]
       end;

julia> @select t :id :x1
3×2 DataFrame
 Row │ id      x1                  
     │ String  Array…              
─────┼─────────────────────────────
   1 │ 1       [2, 22, 25, 5]
   2 │ 2       [2]
   3 │ 3       [24, 54, 89, 12, 2]

EDIT: you want

julia> t = @rtransform df :x1 = begin 
           better_than = :sum .>= 1
           :score[better_than]
       end;