remove vector.NewPuller

It was added in #5613 but never used.

Author: nwt

vector/any.go

@@ -19,20 +19,3 @@ type Promotable interface {
 type Puller interface {
 	Pull(done bool) (Any, error)
 }
-
-type puller struct {
-	vecs []Any
-}
-
-func NewPuller(vecs ...Any) Puller {
-	return &puller{vecs}
-}
-
-func (p *puller) Pull(_ bool) (Any, error) {
-	if len(p.vecs) == 0 {
-		return nil, nil
-	}
-	vec := p.vecs[0]
-	p.vecs = p.vecs[1:]
-	return vec, nil
-}