diff --git a/executor/insert_common.go b/executor/insert_common.go
index d8daf4935f745..520d594fb41a7 100644
--- a/executor/insert_common.go
+++ b/executor/insert_common.go
@@ -74,7 +74,6 @@ type InsertValues struct {
 }
 
 type defaultVal struct {
-	// common default value is a constant.
 	val types.Datum
 	// valid indicates whether the val is evaluated. We evaluate the default value lazily.
 	valid bool
diff --git a/table/column.go b/table/column.go
index 769fd2d9e77d9..e2a347ac8940a 100644
--- a/table/column.go
+++ b/table/column.go
@@ -19,12 +19,12 @@ package table
 
 import (
 	"fmt"
-	"github.com/pingcap/parser"
 	"strconv"
 	"strings"
 	"time"
 	"unicode/utf8"
 
+	"github.com/pingcap/parser"
 	"github.com/pingcap/parser/ast"
 	"github.com/pingcap/parser/charset"
 	"github.com/pingcap/parser/model"