diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleSelectHierachicalQueryClause.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleSelectHierachicalQueryClause.java
deleted file mode 100644
index 3dd0d4097c..0000000000
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleSelectHierachicalQueryClause.java
+++ /dev/null
@@ -1,73 +0,0 @@
-/*
- * Copyright 1999-2017 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.dialect.oracle.ast.stmt;
-
-import com.alibaba.druid.sql.ast.SQLExpr;
-import com.alibaba.druid.sql.dialect.oracle.ast.OracleSQLObjectImpl;
-import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
-
-public class OracleSelectHierachicalQueryClause extends OracleSQLObjectImpl {
-
-    private SQLExpr startWith;
-    private SQLExpr connectBy;
-    private boolean prior   = false;
-    private boolean noCycle = false;
-
-    public OracleSelectHierachicalQueryClause(){
-
-    }
-
-    public boolean isPrior() {
-        return prior;
-    }
-
-    public void setPrior(boolean prior) {
-        this.prior = prior;
-    }
-
-    public void accept0(OracleASTVisitor visitor) {
-        if (visitor.visit(this)) {
-            acceptChild(visitor, this.startWith);
-            acceptChild(visitor, this.connectBy);
-        }
-
-        visitor.endVisit(this);
-    }
-
-    public SQLExpr getStartWith() {
-        return this.startWith;
-    }
-
-    public void setStartWith(SQLExpr startWith) {
-        this.startWith = startWith;
-    }
-
-    public SQLExpr getConnectBy() {
-        return this.connectBy;
-    }
-
-    public void setConnectBy(SQLExpr connectBy) {
-        this.connectBy = connectBy;
-    }
-
-    public boolean isNoCycle() {
-        return this.noCycle;
-    }
-
-    public void setNoCycle(boolean noCycle) {
-        this.noCycle = noCycle;
-    }
-}
diff --git a/src/test/java/com/alibaba/druid/bvt/sql/PagerUtilsTest_hasUnorderedLimit_oracle.java b/src/test/java/com/alibaba/druid/bvt/sql/PagerUtilsTest_hasUnorderedLimit_oracle.java
new file mode 100644
index 0000000000..d7bac89e63
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/sql/PagerUtilsTest_hasUnorderedLimit_oracle.java
@@ -0,0 +1,33 @@
+package com.alibaba.druid.bvt.sql;
+
+import com.alibaba.druid.sql.PagerUtils;
+import com.alibaba.druid.util.JdbcConstants;
+import junit.framework.TestCase;
+
+public class PagerUtilsTest_hasUnorderedLimit_oracle extends TestCase {
+
+    public void test_false() throws Exception {
+        String sql = "SELECT *" + //
+                "\nFROM (SELECT XX.*, ROWNUM AS RN" + //
+                "\n\tFROM (SELECT id, name, salary" + //
+                "\n\t\tFROM t" + //
+                "\n\t\tORDER BY id, name" + //
+                "\n\t\t) XX" + //
+                "\n\tWHERE ROWNUM <= 30" + //
+                "\n\t) XXX" + //
+                "\nWHERE RN > 20";
+        assertFalse(PagerUtils.hasUnorderedLimit(sql, JdbcConstants.ORACLE));
+    }
+
+    public void test_false_1() throws Exception {
+        String sql = " select * from test t";
+        assertFalse(PagerUtils.hasUnorderedLimit(sql, JdbcConstants.ORACLE));
+    }
+
+    public void test_true() throws Exception {
+        String sql = "SELECT *" + //
+                "\nFROM t" + //
+                "\nWHERE ROWNUM <= 10";
+        assertTrue(PagerUtils.hasUnorderedLimit(sql, JdbcConstants.ORACLE));
+    }
+}