Don't truncate UUID columns

[robsmith11]

I think it's fairly common to work with UUID columns when analyzing tabular data, so it would be nice if printing a DataFrame would show the entire UUID rather than truncating the last few characters by default:

julia> DataFrame(u=[UUIDs.uuid4() for _ in 1:5])
5×1 DataFrame
 Row │ u
     │ Base.UUID
─────┼───────────────────────────────────
   1 │ c3a41e1a-1a33-42b0-bba6-4712e7a0…
   2 │ 63825c87-db1a-4942-a18c-65167cf9…
   3 │ bcfc3f6e-182d-4457-a5e8-38a7c375…
   4 │ 398e1253-746a-4314-b33d-0de4a90e…
   5 │ 0f4b8749-e8e6-4dd7-b6d0-90836c2f…

[bkamins]

@ronisbr - do you think it is possible to display whole column if it has UUID eltype? (i.e. to adjust maximum coumn width depending on its eltype?)

[ronisbr]

Hi @bkamins and @robsmith11 !

Yes, it should be very easy, I will do a PR now.

[ronisbr]

Seems to be working:

julia> df = DataFrame(a = 1:10, uuid = [i % 2 == 0 ? missing : Base.UUID.(rand(UInt128)) for i in 1:10])
10×2 DataFrame
 Row │ a      uuid
     │ Int64  Base.UUID?
─────┼─────────────────────────────────────────────
   1 │     1  b0be25f7-1fa8-db3d-7624-293df963fe31
   2 │     2  missing
   3 │     3  20ea39d0-e188-ee29-d3b7-2200acf3a201
   4 │     4  missing
   5 │     5  18beb68e-9e2e-70f3-ab08-39b86859a8e3
   6 │     6  missing
   7 │     7  66cbd1b2-d72a-2d29-c3ae-127aa75db946
   8 │     8  missing
   9 │     9  1224fbcc-a008-b9b7-bb16-9034091b5cf2
  10 │    10  missing

I will just add a test now.