Support arrays using JSON in MyXQL for MariaDB (#668)

Author: odarriba

lib/ecto/adapters/myxql.ex

@@ -159,6 +159,7 @@ defmodule Ecto.Adapters.MyXQL do
   ## Custom MySQL types
 
   @impl true
+  def loaders({:array, _}, type), do: [&json_decode/1, type]
   def loaders({:map, _}, type), do: [&json_decode/1, &Ecto.Type.embedded_load(type, &1, :json)]
   def loaders(:map, type), do: [&json_decode/1, type]
   def loaders(:float, type), do: [&float_decode/1, type]