If I have an Ecto schema something like

defmodule Something do
  use Ecto.Schema
  @primary_key false
  schema "something" do
    field :k1, :string, size: 100, null: false, primary_key: true
    field :k2, :string, size: 100, null: false, primary_key: true
    field :k3, :string, size: 100, null: false, primary_key: true
    field :content, :string, null: false
  end
end

is possible to introspect the schema to know which fields have primary_key: true? I see __meta__ struct, but no data there.

Thank you!