Fix generated nested time array (#680)

Author: greg-rychlewski

lib/ecto/adapters/postgres/connection.ex

@@ -1767,7 +1767,7 @@ if Code.ensure_loaded?(Postgrex) do
 
     defp column_type(type, opts) when type in ~w(time utc_datetime naive_datetime)a do
       generated = Keyword.get(opts, :generated)
-      [ecto_to_db(type), "(0)", generated_expr(generated)]
+      [[ecto_to_db(type), "(0)"], generated_expr(generated)]
     end
 
     defp column_type(type, opts)

test/ecto/adapters/postgres_test.exs

@@ -2376,12 +2376,14 @@ defmodule Ecto.Adapters.PostgresTest do
       {:create, table(:posts),
        [
          {:add, :tags, {:array, {:array, :text}},
-          [generated: ~s|ALWAYS AS (ARRAY['foo','bar']) STORED|]}
+          [generated: ~s|ALWAYS AS (ARRAY['foo','bar']) STORED|]},
+         {:add, :times, {:array, {:array, :time}},
+          [generated: ~s|ALWAYS AS (ARRAY['08:00:00','09:00:00']) STORED|]}
        ]}
 
     assert execute_ddl(create) == [
              """
-             CREATE TABLE "posts" ("tags" text[][] GENERATED ALWAYS AS (ARRAY['foo','bar']) STORED)
+             CREATE TABLE "posts" ("tags" text[][] GENERATED ALWAYS AS (ARRAY['foo','bar']) STORED, "times" time(0)[][] GENERATED ALWAYS AS (ARRAY['08:00:00','09:00:00']) STORED)
              """
              |> remove_newlines
            ]