diff --git a/ascii.go b/ascii.go
index f18d153..1c32964 100644
--- a/ascii.go
+++ b/ascii.go
@@ -31,6 +31,10 @@ func (c *STableField) IsSearchable() bool {
 	return c.spec.IsSearchable()
 }
 
+func (c *STableField) GetWidth() int {
+	return c.spec.GetWidth()
+}
+
 func getTableField(f IQueryField) *STableField {
 	if gotypes.IsNil(f) {
 		return nil
@@ -47,10 +51,10 @@ func getTableField(f IQueryField) *STableField {
 	}
 }
 
-func IsFieldText(f IQueryField) bool {
+func IsLongFieldText(f IQueryField) bool {
 	tf := getTableField(f)
 	if tf != nil {
-		return tf.IsText() && tf.IsSearchable()
+		return tf.IsText() && tf.IsSearchable() && tf.GetWidth() == 0
 	}
 	return false
 }
diff --git a/backends/dameng/conditions.go b/backends/dameng/conditions.go
index 5ffc0e9..482ca18 100644
--- a/backends/dameng/conditions.go
+++ b/backends/dameng/conditions.go
@@ -32,7 +32,7 @@ func (t *SDamengEqualsCondition) WhereClause() string {
 // Equals filter conditions
 func (dameng *SDamengBackend) Equals(f sqlchemy.IQueryField, v interface{}) sqlchemy.ICondition {
 	// log.Debugf("field %s isFieldText: %v %#v", f.Name(), sqlchemy.IsFieldText(f), f)
-	if sqlchemy.IsFieldText(f) {
+	if sqlchemy.IsLongFieldText(f) {
 		c := SDamengEqualsCondition{sqlchemy.NewTupleCondition(f, v)}
 		return &c
 	} else {
diff --git a/backends/dameng/query_test.go b/backends/dameng/query_test.go
index 8462df5..5aab21c 100644
--- a/backends/dameng/query_test.go
+++ b/backends/dameng/query_test.go
@@ -49,7 +49,7 @@ func TestQuery(t *testing.T) {
 	t.Run("query selected fields varchar ", func(t *testing.T) {
 		testReset()
 		q := testTable.Query(testTable.Field("col0")).Equals("col0", "abce")
-		want := `SELECT "t1"."col0" AS "col0" FROM "test" AS "t1" WHERE TEXT_EQUAL("t1"."col0" ,  ? )`
+		want := `SELECT "t1"."col0" AS "col0" FROM "test" AS "t1" WHERE "t1"."col0" =  ? `
 		testGotWant(t, q.String(), want)
 	})