testexpr

type Instance ¶

type Instance struct {
	Rel      *props.Relational
	Required *physical.Required
	Provided *physical.Provided
	Priv     interface{}

	// We embed a RelExpr to provide implementation for the unexported methods of
	// RelExpr. This should not be initialized (resulting in a panic if any of
	// those methods are called).
	memo.RelExpr
}

Instance is a dummy RelExpr that contains various properties that can be extracted via that interface. It can be initialized with whatever subset of fields are required for the particular test; for example:

e := &testexpr.Instance{
  Rel: &props.Relational{...},
  Provided: &physical.Provided{...},
}

func (e *Instance) Child(nth int) opt.Expr

func (e *Instance) ChildCount() int

func (e *Instance) Cost() memo.Cost

func (e *Instance) FirstExpr() memo.RelExpr

func (e *Instance) Memo() *memo.Memo

func (e *Instance) NextExpr() memo.RelExpr

func (e *Instance) Op() opt.Operator

func (e *Instance) Private() interface{}

func (e *Instance) ProvidedPhysical() *physical.Provided

func (e *Instance) Relational() *props.Relational

func (e *Instance) RequiredPhysical() *physical.Required

func (e *Instance) SetChild(nth int, child opt.Expr)

func (e *Instance) String() string