diff --git a/component/topsql/topsql_test.go b/component/topsql/topsql_test.go
index 36bc1da..13e782b 100644
--- a/component/topsql/topsql_test.go
+++ b/component/topsql/topsql_test.go
@@ -2,6 +2,7 @@ package topsql_test
 
 import (
 	"encoding/hex"
+	"fmt"
 	"io/ioutil"
 	"os"
 	"sort"
@@ -604,6 +605,8 @@ func (s *testTopSQLSuite) TestTiKVSummaryBy() {
 		resList = append(resList, tid)
 	}
 	s.Equal(sortListSeq, resList)
+	fmt.Println(res)
+	s.Empty(res)
 	res = res[:0]
 	err = s.dq.SummaryBy(int(testBaseTs), int(testBaseTs+40), 10, 5, instance, tikvInstanceType, query.AggLevelDB, &res)
 	s.NoError(err)