allow any pattern

lib/ecto/query/builder/select.ex

@@ -140,8 +140,7 @@ defmodule Ecto.Query.Builder.Select do
     {k, params_acc}
   end
 
-  defp escape_key({:^, _, [{var, _, context} = k]}, params_acc, _vars, _env)
-       when is_atom(var) and is_atom(context) do
+  defp escape_key({:^, _, [k]}, params_acc, _vars, _env) do
     {k, params_acc}
   end
 

test/ecto/query/builder/select_test.exs

@@ -489,8 +489,12 @@ defmodule Ecto.Query.Builder.SelectTest do
 
     test "supports interpolated map keys" do
       key = :test_key
+
       q = from p in "posts", select: %{^key => 1}
       assert {:%{}, [], [test_key: 1]} = q.select.expr
+
+      q = from p in "posts", select: %{^:test_key => 1}
+      assert {:%{}, [], [test_key: 1]} = q.select.expr
     end
   end
 
@@ -689,6 +693,13 @@ defmodule Ecto.Query.Builder.SelectTest do
           select_merge: %{^shared_key => :new, ^merge_key => :merge}
 
       assert {:%{}, [], [shared: :new, merge: :merge]} = q.select.expr
+
+      q =
+        from p in "posts",
+          select: %{^:shared => :old},
+          select_merge: %{^:shared => :new, ^:merge => :merge}
+
+      assert {:%{}, [], [shared: :new, merge: :merge]} = q.select.expr
     end
   end
 end