Expose FamilySubset struct and a small fix

Change-Id: Ia07847f4c43197d8498ead0e225651fe2b4713d7

bigtable/admin.go

@@ -2249,31 +2249,29 @@ func (av *AuthorizedViewTypeConf) GetSubsetView() (*SubsetViewConf, error) {
 	return av.SubsetView, nil
 }
 
-type familySubset struct {
+// FamilySubset represents a subset of a column family.
+type FamilySubset struct {
 	Qualifiers        [][]byte
 	QualifierPrefixes [][]byte
 }
 
 // SubsetViewConf contains configuration specific to an authorized view of subset view type.
 type SubsetViewConf struct {
 	RowPrefixes   [][]byte
-	FamilySubsets map[string]familySubset
+	FamilySubsets map[string]FamilySubset
 }
 
 // AddRowPrefix adds a new row prefix to the subset view.
 func (s *SubsetViewConf) AddRowPrefix(prefix []byte) {
 	s.RowPrefixes = append(s.RowPrefixes, prefix)
 }
 
-func (s *SubsetViewConf) getFamilySubset(familyName string) familySubset {
+func (s *SubsetViewConf) getFamilySubset(familyName string) FamilySubset {
 	if s.FamilySubsets == nil {
-		s.FamilySubsets = make(map[string]familySubset)
+		s.FamilySubsets = make(map[string]FamilySubset)
 	}
 	if _, ok := s.FamilySubsets[familyName]; !ok {
-		s.FamilySubsets[familyName] = familySubset{
-			Qualifiers:        [][]byte{},
-			QualifierPrefixes: [][]byte{},
-		}
+		s.FamilySubsets[familyName] = FamilySubset{}
 	}
 	return s.FamilySubsets[familyName]
 }
@@ -2297,10 +2295,10 @@ func (s *SubsetViewConf) fillConf(internal *btapb.AuthorizedView_SubsetView) {
 	s.RowPrefixes = [][]byte{}
 	s.RowPrefixes = append(s.RowPrefixes, internal.RowPrefixes...)
 	if s.FamilySubsets == nil {
-		s.FamilySubsets = make(map[string]familySubset)
+		s.FamilySubsets = make(map[string]FamilySubset)
 	}
 	for k, v := range internal.FamilySubsets {
-		s.FamilySubsets[k] = familySubset{
+		s.FamilySubsets[k] = FamilySubset{
 			Qualifiers:        v.Qualifiers,
 			QualifierPrefixes: v.QualifierPrefixes,
 		}

bigtable/integration_test.go

@@ -3660,7 +3660,7 @@ func TestIntegration_DataAuthorizedView(t *testing.T) {
 			AuthorizedViewType: AuthorizedViewTypeSubsetView,
 			SubsetView: &SubsetViewConf{
 				RowPrefixes: [][]byte{[]byte("r1")},
-				FamilySubsets: map[string]familySubset{
+				FamilySubsets: map[string]FamilySubset{
 					"fam1": {
 						QualifierPrefixes: [][]byte{[]byte("col")},
 					},