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exd lib exd query_runner flatten.ex
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lib/exd/query_runner/flatten.ex 

defmodule Exd.Runner.Flatten do

  @moduledoc """

  Flattens a list into a stream of rows

  """



  def flatten(flow, keys) do

    keys

    |> Enum.reduce(flow, fn key, flow ->

      flow

      |> Flow.flat_map(fn record ->

        for element <- Map.get(record.value, key), do: %Exd.Record{record | value: %{record.value | key => element}}

      end)

    end)

  end

  def flatten(flow, _selection), do: flow



end