Coalesce function not working with data frames n x n with n>=2

Internals & Design
2

It might help if you could read Please read: make it easier to help you, and then post a MWE - it is currently unclear what you are trying to do.

From the REPL:

help?> coalesce
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  coalesce(x, y...)

  Return the first value in the arguments which is not equal to missing, if
  any. Otherwise return missing.

  Examples
  ≡≡≡≡≡≡≡≡≡≡

  julia> coalesce(missing, 1)
  1

  julia> coalesce(1, missing)
  1

  julia> coalesce(nothing, 1)  # returns `nothing`

  julia> coalesce(missing, missing)
  missing