Unused local variables in SelectComplexTest file

Problem/Motivation

In core/tests/Drupal/KernelTests/Core/Database/SelectComplexTest.php file testRange() function has unused variables such as $name_field and $age_field

 public function testRangeUndo() {
     $query = $this->connection->select('test');
     $name_field = $query->addField('test', 'name');
     $age_field = $query->addField('test', 'age', 'age');
     $query->range(0, 2);
     $query->range(NULL, NULL);
     $query_result = $query->countQuery()->execute()->fetchField();

Proposed resolution

 public function testRangeUndo() {
     $query = $this->connection->select('test');
-    $name_field = $query->addField('test', 'name');
-    $age_field = $query->addField('test', 'age', 'age');
+    $query->addField('test', 'name');
+    $query->addField('test', 'age', 'age');
     $query->range(0, 2);
     $query->range(NULL, NULL);
     $query_result = $query->countQuery()->execute()->fetchField();