func TestUpdateGCPolicyOnAggregateColumnFamily(t *testing.T) {
	ctx := context.Background()
	s := &server{
		tables: make(map[string]*table),
	}
	tblInfo, err := s.CreateTable(ctx, &btapb.CreateTableRequest{
		Parent:  "cluster",
		TableId: "t",
		Table: &btapb.Table{
			ColumnFamilies: map[string]*btapb.ColumnFamily{
				"sum": {
					ValueType: &btapb.Type{
						Kind: &btapb.Type_AggregateType{
							AggregateType: &btapb.Type_Aggregate{
								InputType: &btapb.Type{
									Kind: &btapb.Type_Int64Type{},
								},
								Aggregator: &btapb.Type_Aggregate_Sum_{
									Sum: &btapb.Type_Aggregate_Sum{},
								},
							},
						},
					},
				},
			},
		},
	})
	if err != nil {
		t.Fatal(err)
	}
	_, err = s.ModifyColumnFamilies(ctx, &btapb.ModifyColumnFamiliesRequest{
		Name: tblInfo.Name,
		Modifications: []*btapb.ModifyColumnFamiliesRequest_Modification{
			{
				Id: "sum",
				Mod: &btapb.ModifyColumnFamiliesRequest_Modification_Update{
					Update: &btapb.ColumnFamily{
						GcRule: &btapb.GcRule{Rule: &btapb.GcRule_MaxNumVersions{MaxNumVersions: 1}},
					},
				},
			},
		},
	})
	if err != nil {
		t.Fatal(err)
	}
}