diff --git a/advisor/heuristic.go b/advisor/heuristic.go
index c8feba434285e91c5fadcc80b02fef1298d91861..82e101d2758da22b17bfb6380336ceebce61aedb 100644
--- a/advisor/heuristic.go
+++ b/advisor/heuristic.go
@@ -309,7 +309,7 @@ func (idxAdv *IndexAdvisor) RuleImplicitConversion() Rule {
 			// 列与值比较
 			for _, val := range values {
 				if colList[0].DataType == "" {
-					common.Log.Debug("Can't get %s data type", colList[0].Name)
+					common.Log.Warn("Can't get %s data type", colList[0].Name)
 					break
 				}
 
diff --git a/advisor/index_test.go b/advisor/index_test.go
index 314655f5ca0eb48de6e0c3cd30f3b85282c6717d..fc9ecd206490eb9a02a1073602dfff979be7d9b6 100644
--- a/advisor/index_test.go
+++ b/advisor/index_test.go
@@ -357,8 +357,9 @@ func TestIndexAdvise(t *testing.T) {
 }
 
 func TestIndexAdviseNoEnv(t *testing.T) {
-	common.Config.OnlineDSN.Disable = true
 	common.Log.Debug("Entering function: %s", common.GetFunctionName())
+	orgOnlineDSNStatus := common.Config.OnlineDSN.Disable
+	common.Config.OnlineDSN.Disable = true
 	vEnv, rEnv := env.BuildEnv()
 	defer vEnv.CleanUp()
 
@@ -384,6 +385,7 @@ func TestIndexAdviseNoEnv(t *testing.T) {
 			}
 		}
 	}
+	common.Config.OnlineDSN.Disable = orgOnlineDSNStatus
 	common.Log.Debug("Exiting function: %s", common.GetFunctionName())
 }
 
diff --git a/ast/rewrite_test.go b/ast/rewrite_test.go
index 043acb9080d0783b6bec8a4f24a57562d1ff9e74..b0758e43bd7ed647804497112a18af589212c38a 100644
--- a/ast/rewrite_test.go
+++ b/ast/rewrite_test.go
@@ -25,6 +25,7 @@ import (
 )
 
 func TestRewrite(t *testing.T) {
+	orgTestDSNStatus := common.Config.TestDSN.Disable
 	common.Config.TestDSN.Disable = false
 	testSQL := []map[string]string{
 		{
@@ -97,9 +98,11 @@ func TestRewrite(t *testing.T) {
 			t.Errorf("want: %s\ngot: %s", sql["output"], rw.NewSQL)
 		}
 	}
+	common.Config.TestDSN.Disable = orgTestDSNStatus
 }
 
 func TestRewriteStar2Columns(t *testing.T) {
+	orgTestDSNStatus := common.Config.TestDSN.Disable
 	common.Config.TestDSN.Disable = false
 	testSQL := []map[string]string{
 		{
@@ -127,6 +130,7 @@ func TestRewriteStar2Columns(t *testing.T) {
 			t.Errorf("want: %s\ngot: %s", sql["output"], rw.NewSQL)
 		}
 	}
+	common.Config.TestDSN.Disable = orgTestDSNStatus
 }
 
 func TestRewriteInsertColumns(t *testing.T) {
@@ -427,6 +431,7 @@ func TestRewriteAlwaysTrue(t *testing.T) {
 
 // TODO:
 func TestRewriteSubQuery2Join(t *testing.T) {
+	orgTestDSNStatus := common.Config.TestDSN.Disable
 	common.Config.TestDSN.Disable = true
 	testSQL := []map[string]string{
 		{
@@ -452,6 +457,7 @@ func TestRewriteSubQuery2Join(t *testing.T) {
 			t.Errorf("want: %s\ngot: %s", sql["output"], rw.NewSQL)
 		}
 	}
+	common.Config.TestDSN.Disable = orgTestDSNStatus
 }
 
 func TestRewriteDML2Select(t *testing.T) {
diff --git a/database/show.go b/database/show.go
index db4604324668dcb990d99fb57116cc43f9c734c8..a49dc5e978e9f3051b4a72ad695d1f0681b3c805 100644
--- a/database/show.go
+++ b/database/show.go
@@ -371,7 +371,8 @@ func (td TableDesc) Columns() []string {
 
 // showCreate show create
 func (db *Connector) showCreate(createType, name string) (string, error) {
-	// 执行 show create table
+	// 执行 show create table|database
+	// createType = [table|database]
 	res, err := db.Query(fmt.Sprintf("show create %s `%s`", createType, name))
 	if err != nil {
 		return "", err
@@ -461,14 +462,17 @@ func (db *Connector) FindColumn(name, dbName string, tables ...string) ([]*commo
 
 	var col common.Column
 	for res.Rows.Next() {
-		var character, collation string
-		res.Rows.Scan(&col.Table,
+		var character, collation []byte
+		res.Rows.Scan(
+			&col.Table,
 			&col.DB,
 			&col.DataType,
 			&character,
-			&collation)
-		col.Character = character
-		col.Collation = collation
+			&collation,
+		)
+		col.Name = name
+		col.Character = string(character)
+		col.Collation = string(collation)
 		// 填充字符集和排序规则
 		if col.Character == "" {
 			// 当从`INFORMATION_SCHEMA`.`COLUMNS`表中查询不到相关列的character和collation的信息时
diff --git a/database/testdata/TestFindColumn.golden b/database/testdata/TestFindColumn.golden
index c7deffee353e83627e818875dd3bf283304ce80d..1a7d85e04cf919839f826a2b5b9ae9125994164b 100644
--- a/database/testdata/TestFindColumn.golden
+++ b/database/testdata/TestFindColumn.golden
@@ -1,6 +1,6 @@
 []*common.Column{
     &common.Column{
-        Name:        "",
+        Name:        "film_id",
         Alias:       nil,
         Table:       "film",
         DB:          "sakila",