diff --git a/codegen.go b/codegen.go
index 564d0d4..5fc4274 100644
--- a/codegen.go
+++ b/codegen.go
@@ -189,7 +189,7 @@ func (field *FieldDescriptor) fixField(allFieldName, escapeFieldNames map[string
 		field.Type = IntType().WithNewType(field.Type.Type)
 	}
 	if field.Nullable && opt.DisableNullToPoint {
-		gt, ok := sqlNullValueGoType[field.Type.Type]
+		gt, ok := getSQLNullValueGoType(field.Type.Type)
 		if ok {
 			field.Type = gt
 			field.GoPointer = false
diff --git a/go_type_well_known.go b/go_type_well_known.go
index ee7322a..08e3103 100644
--- a/go_type_well_known.go
+++ b/go_type_well_known.go
@@ -55,6 +55,11 @@ var sqlNullValueGoType = map[Type]GoType{
 	TypeTime:    sqlNullTimeType,
 }
 
+func getSQLNullValueGoType(t Type) (GoType, bool) {
+	v, ok := sqlNullValueGoType[t]
+	return v, ok
+}
+
 func BoolType() GoType           { return boolType }
 func IntType() GoType            { return intType }
 func Int8Type() GoType           { return int8Type }
diff --git a/internal/insql/insqlx.go b/internal/insql/insqlx.go
index caffc8d..850a61e 100644
--- a/internal/insql/insqlx.go
+++ b/internal/insql/insqlx.go
@@ -62,20 +62,6 @@ func Collation(elements []schema.Attr) (string, bool) {
 	return val.V, ok
 }
 
-// DefaultValue returns the string represents the DEFAULT of a column.
-func DefaultValue(c *schema.Column) (string, bool) {
-	switch x := schema.UnderlyingExpr(c.Default).(type) {
-	case nil:
-		return "", false
-	case *schema.Literal:
-		return x.V, true
-	case *schema.RawExpr:
-		return x.X, true
-	default:
-		panic(fmt.Sprintf("unexpected default value type: %T", x))
-	}
-}
-
 func IndexEqual(idx1, idx2 *schema.Index) bool {
 	return idx1 != nil && idx2 != nil && (idx1 == idx2 || idx1.Name == idx2.Name)
 }
diff --git a/matcher/matcher.go b/matcher/matcher.go
index 59aa964..abb41ff 100644
--- a/matcher/matcher.go
+++ b/matcher/matcher.go
@@ -8,7 +8,6 @@ import (
 var reJSONTag = regexp.MustCompile(`^.*\[@(?i:jsontag):\s*([^\[\]]*)\].*`)
 var reAffixJSONTag = regexp.MustCompile(`^.*\[@(affix)\s*\].*`)
 var reProtobufType = regexp.MustCompile(`^.*\[@(?i:pbtype):\s*([^\[\]]*)\].*`)
-var reProtobufEnumValue = regexp.MustCompile(`@EnumValue\[[^\]]*\]`)
 
 // JsonTag 匹配json标签
 // [@jsontag:id,omitempty]
@@ -36,8 +35,3 @@ func PbType(comment string) string {
 	}
 	return ""
 }
-
-// TrimEnumValue 去除 @EnumValue[xxxx] 的数据
-func TrimEnumValue(value string) string {
-	return strings.TrimSpace(reProtobufEnumValue.ReplaceAllString(value, ""))
-}
diff --git a/matcher/matcher_test.go b/matcher/matcher_test.go
index 407d392..4312b5a 100644
--- a/matcher/matcher_test.go
+++ b/matcher/matcher_test.go
@@ -125,8 +125,3 @@ func Test_ProtobufType(t *testing.T) {
 		})
 	}
 }
-
-func Test_TrimEnumValue(t *testing.T) {
-	a := TrimEnumValue("some text@EnumValue[1:a,2:哈哈]")
-	t.Log(a)
-}