diff --git a/ast/pretty_test.go b/ast/pretty_test.go
index 15a4ef5657dd76aa12178df68b8f2a0e2c0904b0..9c0a002832e36b3600dcbe334a30969c09ca0ef9 100644
--- a/ast/pretty_test.go
+++ b/ast/pretty_test.go
@@ -131,6 +131,10 @@ func TestPretty(t *testing.T) {
 			fmt.Println(sql)
 			fmt.Println(Pretty(sql, "builtin"))
 		}
+		orgMaxPrettySQLLength := common.Config.MaxPrettySQLLength
+		common.Config.MaxPrettySQLLength = 1
+		fmt.Println(Pretty("select 1", "builtin"))
+		common.Config.MaxPrettySQLLength = orgMaxPrettySQLLength
 	}, t.Name(), update)
 	if nil != err {
 		t.Fatal(err)
diff --git a/ast/testdata/TestPretty.golden b/ast/testdata/TestPretty.golden
index 95f55297014665b71fece1f7ebf6363511f6889d..6aa57d445421f6f2305974c5180ed727cece9c14 100644
--- a/ast/testdata/TestPretty.golden
+++ b/ast/testdata/TestPretty.golden
@@ -1100,26 +1100,25 @@ SELECT
   c. city_id  
 FROM  
   sakila. city  c);
-SELECT visitor_id, url FROM (SELECT id FROM log WHERE ip="123.45.67.89" order by ts desc limit 50, 10) I JOIN log ON (I.id=log.id) JOIN url ON (url.id=log.url_id) order by TS desc;
+SELECT city FROM( SELECT city_id FROM city WHERE city = "A Corua (La Corua)" ORDER BY last_update DESC LIMIT 50, 10) I JOIN city ON (I.city_id = city.city_id) JOIN country ON (country.country_id = city.country_id) ORDER BY city DESC;
 
 SELECT  
-  visitor_id, url  
-FROM  
-  (
+  city  
+FROM( 
 SELECT  
-  id  
+  city_id  
 FROM  
-  LOG  
+  city  
 WHERE  
-  ip= "123.45.67.89" 
+  city  = "A Corua (La Corua)" 
 ORDER BY  
-  ts  desc  
+  last_update  DESC  
 LIMIT  
   50, 10) I  
-  JOIN  LOG  ON  (I. id= LOG. id) 
-  JOIN  url  ON  (url. id= LOG. url_id) 
+  JOIN  city  ON  (I. city_id  = city. city_id) 
+  JOIN  country  ON  (country. country_id  = city. country_id) 
 ORDER BY  
-  TS  desc;
+  city  DESC;
 DELETE city, country FROM city INNER JOIN country using (country_id) WHERE city.city_id = 1;
 DELETE  city, country  
 FROM  
@@ -1490,24 +1489,24 @@ ADD
               ADD  
           index  `idx_store_film` (
             `store_id`, `film_id`);
-SELECT	DATE_FORMAT(t.atm, '%Y-%m-%d'),	COUNT(DISTINCT (t.usr))	FROM usr_terminal t WHERE t.atm > '2018-10-22 00:00:00'	AND t.agent LIKE '%Chrome%'	AND t.system = 'eip' GROUP BY DATE_FORMAT(t.atm, '%Y-%m-%d') ORDER BY DATE_FORMAT(t.atm, '%Y-%m-%d');
+SELECT	DATE_FORMAT(t.last_update, '%Y-%m-%d'),	COUNT(DISTINCT (t.city))	FROM city t WHERE t.last_update > '2018-10-22 00:00:00'	AND t.city LIKE '%Chrome%'	AND t.city = 'eip' GROUP BY DATE_FORMAT(t.last_update, '%Y-%m-%d') ORDER BY DATE_FORMAT(t.last_update, '%Y-%m-%d');
 
 SELECT  
-  DATE_FORMAT( t. atm, '%Y-%m-%d'
+  DATE_FORMAT( t. last_update, '%Y-%m-%d'
 ), 
 COUNT( DISTINCT  (
-  t. usr)) 
+  t. city)) 
   FROM  
-    usr_terminal  t  
+    city  t  
   WHERE  
-    t. atm  > '2018-10-22 00:00:00' 
-    AND  t. agent  LIKE  '%Chrome%' 
-    AND  t. system  = 'eip' 
+    t. last_update  > '2018-10-22 00:00:00' 
+    AND  t. city  LIKE  '%Chrome%' 
+    AND  t. city  = 'eip' 
   GROUP BY  
-    DATE_FORMAT( t. atm, '%Y-%m-%d'
+    DATE_FORMAT( t. last_update, '%Y-%m-%d'
 ) 
 ORDER BY  
-  DATE_FORMAT( t. atm, '%Y-%m-%d'
+  DATE_FORMAT( t. last_update, '%Y-%m-%d'
 );
 create table hello.t (id int unsigned);
 create  table  hello. t  (id  int  unsigned);
@@ -1525,3 +1524,4 @@ ALTER TABLE
   tb  alter  column  id  
 DROP  
   DEFAULT;
+select 1
diff --git a/ast/testdata/TestStmtNode2JSON.golden b/ast/testdata/TestStmtNode2JSON.golden
index 2ac531447657fbf063b3d20d48f9cb091be65f23..407d399e7e56a32ced437135ce4018dccf35d4bf 100644
--- a/ast/testdata/TestStmtNode2JSON.golden
+++ b/ast/testdata/TestStmtNode2JSON.golden
@@ -42,3 +42,4 @@
     "IsInBraces": false
   }
 ]
+
diff --git a/ast/testdata/TestVitessStmtNode2JSON.golden b/ast/testdata/TestVitessStmtNode2JSON.golden
index 2f440983f5c43a6e1c1ecd4521c5027d9617542f..155fd390726a76fc77c5edc618ba46bc2431fdd3 100644
--- a/ast/testdata/TestVitessStmtNode2JSON.golden
+++ b/ast/testdata/TestVitessStmtNode2JSON.golden
@@ -30,3 +30,4 @@
   "Limit": null,
   "Lock": ""
 }
+
diff --git a/ast/tidb_test.go b/ast/tidb_test.go
index 72d210d064509619cde393d738431b57e321fecc..641ff0ca049b1412270caa1ae5519728b2fef25b 100644
--- a/ast/tidb_test.go
+++ b/ast/tidb_test.go
@@ -27,6 +27,7 @@ func TestPrintPrettyStmtNode(t *testing.T) {
 	common.Log.Debug("Entering function: %s", common.GetFunctionName())
 	sqls := []string{
 		`select 1`,
+		`select * f`, // syntax error case
 	}
 	err := common.GoldenDiff(func() {
 		for _, sql := range sqls {
@@ -43,6 +44,7 @@ func TestStmtNode2JSON(t *testing.T) {
 	common.Log.Debug("Entering function: %s", common.GetFunctionName())
 	sqls := []string{
 		`select 1`,
+		`select * f`, // syntax error case
 	}
 	err := common.GoldenDiff(func() {
 		for _, sql := range sqls {
diff --git a/ast/vitess_test.go b/ast/vitess_test.go
index 45ce5501689aa1ada88ae5d8c0e6d323099741ce..c50e92988cb1609250ea488997ce4bd7ffb31f70 100644
--- a/ast/vitess_test.go
+++ b/ast/vitess_test.go
@@ -27,6 +27,7 @@ func TestPrintPrettyVitessStmtNode(t *testing.T) {
 	common.Log.Debug("Entering function: %s", common.GetFunctionName())
 	sqls := []string{
 		`select 1`,
+		`select * f`, // syntax error case
 	}
 	err := common.GoldenDiff(func() {
 		for _, sql := range sqls {
@@ -43,6 +44,7 @@ func TestVitessStmtNode2JSON(t *testing.T) {
 	common.Log.Debug("Entering function: %s", common.GetFunctionName())
 	sqls := []string{
 		`select 1`,
+		`select * f`, // syntax error case
 	}
 	err := common.GoldenDiff(func() {
 		for _, sql := range sqls {