parse

type AndNode struct {
	NodeType
	Nodes []*ExprNode
}

type ConstantNode struct {
	NodeType
	Name string
}

type ExprNode struct {
	NodeType
	Field    *FieldNode
	Op       *OperatorNode
	Val      Node
	Negative bool
}

type FieldNode struct {
	NodeType
	Name string
}

type Node interface {
	Type() NodeType
	String() string
}

type NodeType int

type NumberNode struct {
	NodeType
	Val int64
}

type Operator string

type OperatorNode struct {
	NodeType
	Val Operator
}

type StringNode struct {
	NodeType
	Quoted string
}