Transform! to destructure NamedTuple into columns

General Usage
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2

You can use AsTable:

julia> transform(df, :y => AsTable)
2×4 DataFrame
 Row │ x         y               a      b     
     │ Float64   NamedTup…       Int64  Int64 
─────┼────────────────────────────────────────
   1 │ 0.459213  (a = 1, b = 2)      1      2
   2 │ 0.241038  (a = 3, b = 5)      3      5
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