[+] allow to Scan() destination of *interface{} type, fixes #73 (#74

)

* [+] allow to `Scan()` destination of `*interface{}` type, fixes #73

rows.go

@@ -83,11 +83,11 @@ func (rs *rowSets) Scan(dest ...interface{}) error {
 			continue
 		}
 		val := reflect.ValueOf(col)
-		if destVal.Elem().Kind() == val.Kind() {
+		if _, ok := dest[i].(*interface{}); ok || destVal.Elem().Kind() == val.Kind() {
 			if destElem := destVal.Elem(); destElem.CanSet() {
 				destElem.Set(val)
 			} else {
-				return fmt.Errorf("Cannot set destination value for column %s", string(r.defs[i].Name))
+				return fmt.Errorf("Cannot set destination  value for column %s", string(r.defs[i].Name))
 			}
 		} else {
 			// Try to use Scanner interface

rows_test.go

@@ -9,6 +9,25 @@ import (
 	"github.com/jackc/pgconn"
 )
 
+func TestPointerToInterfaceArgument(t *testing.T) {
+	mock, err := NewPool()
+	if err != nil {
+		panic(err)
+	}
+
+	mock.ExpectQuery(`SELECT 123`).
+		WillReturnRows(
+			mock.NewRows([]string{"id"}).
+				AddRow(int64(123))) // Value which should be scanned in *interface{}
+
+	var value interface{}
+	err = mock.QueryRow(context.Background(), `SELECT 123`).Scan(&value)
+	if err != nil || value.(int64) != 123 {
+		t.Error(err)
+	}
+
+}
+
 func TestExplicitTypeCasting(t *testing.T) {
 	mock, err := NewPool()
 	if err != nil {