diff --git a/src/main/java/com/alibaba/druid/sql/ast/SQLStatementImpl.java b/src/main/java/com/alibaba/druid/sql/ast/SQLStatementImpl.java
index 7f7ae9a420..e800cb3d3a 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/SQLStatementImpl.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/SQLStatementImpl.java
@@ -1,36 +1,37 @@
-/*
- * Copyright 1999-2011 Alibaba Group Holding Ltd.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package com.alibaba.druid.sql.ast;
-
-import com.alibaba.druid.sql.visitor.SQLASTVisitor;
-
-public abstract class SQLStatementImpl extends SQLObjectImpl implements SQLStatement {
-
-    private static final long serialVersionUID = 1L;
-
-    public SQLStatementImpl(){
-
-    }
-
-    public void output(StringBuffer buf) {
-        buf.append(super.toString());
-    }
-
-    @Override
-    protected void accept0(SQLASTVisitor visitor) {
-        throw new UnsupportedOperationException(this.getClass().getName());
-    }
-}
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.sql.ast;
+
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+public abstract class SQLStatementImpl extends SQLObjectImpl implements SQLStatement {
+
+    private static final long serialVersionUID = 1L;
+
+    public SQLStatementImpl(){
+
+    }
+
+    public String toString() {
+        return SQLUtils.toSQLString(this);
+    }
+
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        throw new UnsupportedOperationException(this.getClass().getName());
+    }
+}
diff --git a/src/test/java/com/alibaba/druid/bvt/sql/oracle/OracleMergeTest7.java b/src/test/java/com/alibaba/druid/bvt/sql/oracle/OracleMergeTest7.java
new file mode 100644
index 0000000000..8085e5b8c7
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/sql/oracle/OracleMergeTest7.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.sql.oracle;
+
+import java.util.List;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.sql.OracleTest;
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleMergeStatement;
+import com.alibaba.druid.sql.dialect.oracle.parser.OracleStatementParser;
+import com.alibaba.druid.sql.parser.SQLStatementParser;
+
+public class OracleMergeTest7 extends OracleTest {
+
+    public void test_0() throws Exception {
+        String sql = "MERGE INTO copy_emp c " + //
+                     "USING employees e " + //
+                     "ON (c.employee_id=e.employee_id) " + //
+                     "WHEN MATCHED THEN " + //
+                     "UPDATE SET " + //
+                     "c.first_name=e.first_name, " + //
+                     "c.last_name=e.last_name, " + //
+                     "c.department_id=e.department_id " + //
+                     "WHEN NOT MATCHED THEN " + //
+                     "INSERT VALUES(e.employee_id,e.first_name,e.last_name," + //
+                     "e.email,e.phone_number,e.hire_date,e.job_id, " + //
+                     "e.salary,e.commission_pct,e.manager_id,e.department_id)";
+
+        SQLStatementParser parser = new OracleStatementParser(sql);
+        List<SQLStatement> stmtList = parser.parseStatementList();
+        OracleMergeStatement mergeStatement = (OracleMergeStatement) stmtList.get(0);
+        String result = SQLUtils.toOracleString(mergeStatement);
+        Assert.assertEquals("MERGE INTO copy_emp c" //
+                                    + "\nUSING employees e ON c.employee_id = e.employee_id" //
+                                    + "\nWHEN MATCHED THEN UPDATE SET c.first_name = e.first_name, c.last_name = e.last_name, c.department_id = e.department_id" //
+                                    + "\nWHEN NOT MATCHED THEN INSERT VALUES (e.employee_id, e.first_name, e.last_name, e.email, e.phone_number, e.hire_date, e.job_id, e.salary, e.commission_pct, e.manager_id, e.department_id)",
+                            result);
+        // Assert.assertTrue(visitor.getColumns().contains(new TableStat.Column("employees", "employee_id")));
+        // Assert.assertTrue(visitor.getColumns().contains(new TableStat.Column("employees", "salary")));
+        // Assert.assertTrue(visitor.getColumns().contains(new TableStat.Column("employees", "department_id")));
+        // Assert.assertTrue(visitor.getColumns().contains(new TableStat.Column("bonuses", "employee_id")));
+        // Assert.assertTrue(visitor.getColumns().contains(new TableStat.Column("bonuses", "bonus")));
+    }
+
+}