if (indexOf < 0)
                return new Pair<>(field, null);
            final String indexField = indexOf == 0 ? defaultField : field.substring(0, indexOf);
            final String extensionKey = field.substring(indexOf + 1);
            return new Pair<>(indexField, extensionKey);
        }
    }

	if !ok || requestInfo == nil || requestInfo.Verb != "watch" {
		return nil
	}

	var index *indexValue
	if indexField, ok := w.indexes[requestInfo.Resource]; ok {
		index = &indexValue{
			resource: requestInfo.Resource,
			value:    getIndexValue(r, indexField),
		}
	}

	identifier := &watchIdentifier{
		apiGroup:  requestInfo.APIGroup,
		resource:  requestInfo.Resource,

func createPodPredicate(field fields.Selector, namespaceScoped bool, indexField []string) storage.SelectionPredicate {
	return storage.SelectionPredicate{
		Label:       labels.Everything(),
		Field:       field,
		GetAttrs:    determinePodGetAttrFunc(namespaceScoped, indexField),
		IndexFields: indexField,
	}
}

func determinePodGetAttrFunc(namespaceScoped bool, indexField []string) storage.AttrFunc {
	if indexField != nil {

		labelSelector, fieldSelector string
		indexLabels                  []string
		indexFields                  []string
		expected                     []MatchValue
		ctx                          context.Context
	}{
		"Match nil": {
			labelSelector: "name=foo",
			fieldSelector: "uid=12345",
			indexLabels:   []string{"bar"},
			indexFields:   []string{},
			ctx:           context.Background(),
			expected:      nil,
		},

	return s.Label.Empty() && s.Field.Empty()
}

// For any index defined by IndexFields, if a matcher can match only (a subset)
// of objects that return <value> for a given index, a pair (<index name>, <value>)
// wil be returned.
func (s *SelectionPredicate) MatcherIndex(ctx context.Context) []MatchValue {
	var result []MatchValue
	for _, field := range s.IndexFields {
		if value, ok := s.Field.RequiresExactMatch(field); ok {

	var indexFields = []string{"spec.nodeName"}
	if utilfeature.DefaultFeatureGate.Enabled(features.StorageNamespaceIndex) {
		indexFields = append(indexFields, "metadata.namespace")
	}
	return storage.SelectionPredicate{
		Label:       label,
		Field:       field,
		GetAttrs:    GetAttrs,
		IndexFields: indexFields,
	}
}

func Match(label labels.Selector, field fields.Selector) storage.SelectionPredicate {
	return storage.SelectionPredicate{
		Label:       label,
		Field:       field,
		GetAttrs:    GetAttrs,
		IndexFields: []string{"nodeName"},
	}
}

// toSelectableFields returns a field set that represents the object
// TODO: fields are not labels, and the validation rules for them do not apply.

		scope.name = selectorName
	}

	triggerValue, triggerSupported := "", false
	if c.indexedTrigger != nil {
		for _, field := range pred.IndexFields {
			if field == c.indexedTrigger.indexName {
				if value, ok := pred.Field.RequiresExactMatch(field); ok {
					triggerValue, triggerSupported = value, true
					break
				}
			}
		}
	}