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type Catalog interface {
	Engine(name string) (engines.Engine, error)
}

type NodeBeforeExecFunc func(ctx context.Context, db *db.Pool, node *QueryPlanNode) error

type NodeFunc func(node *QueryPlanNode, children Results, params []any) (string, []any, error)

type QueryPlan struct {
	Query    *ast.Field
	RootNode *QueryPlanNode

	CompiledQuery string
	Params        []any
}

type QueryPlanNode struct {
	Name        string
	Query       *ast.Field
	Nodes       QueryPlanNodes
	Comment     string
	CollectFunc NodeFunc

	BeforeParamsLen int
	AddedParams     int
	Parent          *QueryPlanNode

	Before NodeBeforeExecFunc
	// contains filtered or unexported fields
}

type QueryPlanNodes []*QueryPlanNode

type Result struct {
	Name     string
	Result   string
	Params   []any
	Children Results
}

type Results []*Result

type Service struct {
	// contains filtered or unexported fields
}