protected function _inspectExpression(ExpressionInterface $expression, $bundle, Query $query)
    {
        if ($expression instanceof Comparison) {
            $expression = $this->_inspectComparisonExpression($expression, $bundle, $query);
        } elseif ($expression instanceof UnaryExpression) {
            $expression = $this->_inspectUnaryExpression($expression, $bundle, $query);
        }

        return $expression;
    }