"clone" at active_record relation

inside Rails source, at


I found a lot of calls to:

relation = clone

I can understand where id the “relation” call, but… how about “clone”
?
Perhaps “clone” comes from Ruby1.9-Kernel, but I am not sure.
And github color it in blue, like a class…weird…

def where(opts, *rest)
  relation = clone

  if opts.present? && value = build_where(opts, rest)
    relation.where_values += Array.wrap(value)
  end

  relation
end

Can somebody explain this “clone” ? Where it come from ?
Thanks

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