Constructs an Insert object.
Drupal\Core\Database\Connection $connection: A DatabaseConnection object.
string $table: Name of the table to associate with this query.
array $options: Array of database options.
Overrides Query::__construct
public function __construct($connection, $table, array $options = array()) {
  if (!isset($options['return'])) {
    $options['return'] = Database::RETURN_INSERT_ID;
  }
  parent::__construct($connection, $options);
  $this->table = $table;
}