fix dropdata

db.go

@@ -134,8 +134,9 @@ func (db *DB) DropData(ctx context.Context) error {
 	}
 
 	p := &pb.Proposal{Mutations: &pb.Mutations{
-		GroupId: 1,
-		DropOp:  pb.Mutations_DATA,
+		GroupId:   1,
+		DropOp:    pb.Mutations_DATA,
+		DropValue: strconv.FormatUint(0, 10),
 	}}
 	if err := worker.ApplyMutations(ctx, p); err != nil {
 		return fmt.Errorf("error applying mutation: %w", err)

db_test.go

@@ -154,6 +154,44 @@ func TestNonGalaxyNamespace(t *testing.T) {
 
 }
 
+func TestDropData(t *testing.T) {
+	db, err := modusdb.New(modusdb.NewDefaultConfig(t.TempDir()))
+	require.NoError(t, err)
+	defer db.Close()
+
+	require.NoError(t, db.DropAll(context.Background()))
+	require.NoError(t, db.AlterSchema(context.Background(), "name: string @index(exact) .", 0))
+
+	_, err = db.Mutate(context.Background(), []*api.Mutation{
+		{
+			Set: []*api.NQuad{
+				{
+					Namespace:   0,
+					Subject:     "_:aman",
+					Predicate:   "name",
+					ObjectValue: &api.Value{Val: &api.Value_StrVal{StrVal: "A"}},
+				},
+			},
+		},
+	}, 0)
+	require.NoError(t, err)
+
+	query := `{
+			me(func: has(name)) {
+				name
+			}
+		}`
+	qresp, err := db.Query(context.Background(), query, 0)
+	require.NoError(t, err)
+	require.JSONEq(t, `{"me":[{"name":"A"}]}`, string(qresp.GetJson()))
+
+	require.NoError(t, db.DropData(context.Background()))
+
+	qresp, err = db.Query(context.Background(), query, 0)
+	require.NoError(t, err)
+	require.JSONEq(t, `{"me":[]}`, string(qresp.GetJson()))
+}
+
 func TestMultipleNamespaces(t *testing.T) {
 	db, err := modusdb.New(modusdb.NewDefaultConfig(t.TempDir()))
 	require.NoError(t, err)