Do not set num_rows to non-nil atom, closes #767

Author: josevalim

lib/postgrex/protocol.ex

@@ -2730,7 +2730,7 @@ defmodule Postgrex.Protocol do
   defp copied(%{connection_id: connection_id}) do
     %Postgrex.Result{
       command: :copy_stream,
-      num_rows: :copy_stream,
+      num_rows: nil,
       rows: nil,
       columns: nil,
       connection_id: connection_id

lib/postgrex/result.ex

@@ -17,7 +17,7 @@ defmodule Postgrex.Result do
           command: atom | [atom],
           columns: [String.t()] | nil,
           rows: [[term] | binary] | nil,
-          num_rows: integer,
+          num_rows: integer | nil,
           connection_id: pos_integer,
           messages: [map()]
         }

test/stream_test.exs

@@ -409,7 +409,7 @@ defmodule StreamTest do
       assert_received %DBConnection.LogEntry{} = entry
       assert entry.query.query == query
 
-      assert {:ok, ^query, %{command: :copy_stream, rows: nil, num_rows: :copy_stream}} =
+      assert {:ok, ^query, %{command: :copy_stream, rows: nil, num_rows: nil}} =
                entry.result
 
       assert_received %DBConnection.LogEntry{} = entry
@@ -678,7 +678,7 @@ defmodule StreamTest do
       assert_received %DBConnection.LogEntry{} = entry
       assert entry.query.query == query_in
 
-      assert {:ok, ^query_in, %{command: :copy_stream, rows: nil, num_rows: :copy_stream}} =
+      assert {:ok, ^query_in, %{command: :copy_stream, rows: nil, num_rows: nil}} =
                entry.result
 
       assert_received %DBConnection.LogEntry{} = entry
@@ -706,7 +706,7 @@ defmodule StreamTest do
       assert_received %DBConnection.LogEntry{} = entry
       assert entry.query.query == query_in
 
-      assert {:ok, ^query_in, %{command: :copy_stream, rows: nil, num_rows: :copy_stream}} =
+      assert {:ok, ^query_in, %{command: :copy_stream, rows: nil, num_rows: nil}} =
                entry.result
 
       assert_received %DBConnection.LogEntry{} = entry
@@ -746,7 +746,7 @@ defmodule StreamTest do
       assert_received %DBConnection.LogEntry{} = entry
       assert entry.query.query == query_in
 
-      assert {:ok, ^query_in, %{command: :copy_stream, rows: nil, num_rows: :copy_stream}} =
+      assert {:ok, ^query_in, %{command: :copy_stream, rows: nil, num_rows: nil}} =
                entry.result
 
       assert_received %DBConnection.LogEntry{} = entry