Fix issue with macro expansion in over clause's order_by

[Gigitsu]

Fixes a regression that prevents some queries from compiling correctly.

Current behavior

Given the following setup:

defmodule MyQueryUtils do
  defmacro foo(table) do
    quote(do: unquote(table).priority > 0)
  end
end

defmodule Post do
  use Ecto.Schema

  @primary_key false
  schema "posts" do
    field :title, :string
    field :priority, :integer
  end
end

This query no longer compiles:

import MyQueryUtils
import Ecto.Query

select(Post, [o], %{row_number: over(row_number(), order_by: [desc: foo(o)])})

With the following error:

** (KeyError) key :module not found in: {#Macro.Env<
   aliases: [],
   ...
 >, #Function<4.25497058/5 in Ecto.Query.Builder.Select.escape_expansion>}

If you are using the dot syntax, such as map.field, make sure the left-hand side of the dot is a map
    (elixir 1.18.3) lib/macro/env.ex:539: Macro.Env.expand_import/5
    (elixir 1.18.3) lib/macro.ex:1877: Macro.do_expand_once/2
    (elixir 1.18.3) lib/macro.ex:1824: Macro.expand_once/2
    (ecto 3.13.1) lib/ecto/query/builder.ex:1101: Ecto.Query.Builder.try_expansion/5
    (ecto 3.13.1) lib/ecto/query/builder/order_by.ex:79: Ecto.Query.Builder.OrderBy.do_escape/5
    (elixir 1.18.3) lib/enum.ex:1316: anonymous fn/3 in Enum.flat_map_reduce/3
    (elixir 1.18.3) lib/enum.ex:4968: Enumerable.List.reduce/3
    (elixir 1.18.3) lib/enum.ex:1315: Enum.flat_map_reduce/3

[greg-rychlewski]

One tiny comment then it's good to go! Thank you

[greg-rychlewski]

Thanks very much for the fix!

[Gigitsu]

Great! Thank you