diff --git a/src/main/java/com/alibaba/druid/sql/ast/SQLZOrderBy.java b/src/main/java/com/alibaba/druid/sql/ast/SQLZOrderBy.java
new file mode 100644
index 0000000000..3b350b9723
--- /dev/null
+++ b/src/main/java/com/alibaba/druid/sql/ast/SQLZOrderBy.java
@@ -0,0 +1,133 @@
+/*
+ * 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.ast;
+
+import com.alibaba.druid.sql.ast.statement.SQLSelectOrderByItem;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public final class SQLZOrderBy extends SQLObjectImpl implements SQLReplaceable {
+
+    protected final List<SQLSelectOrderByItem> items = new ArrayList<SQLSelectOrderByItem>();
+
+    // for postgres
+    private boolean                            sibings;
+
+    public SQLZOrderBy(){
+
+    }
+
+    public SQLZOrderBy(SQLExpr expr){
+        SQLSelectOrderByItem item = new SQLSelectOrderByItem(expr);
+        addItem(item);
+    }
+
+    public SQLZOrderBy(SQLExpr expr, SQLOrderingSpecification type){
+        SQLSelectOrderByItem item = new SQLSelectOrderByItem(expr, type);
+        addItem(item);
+    }
+
+    public void addItem(SQLSelectOrderByItem item) {
+        if (item != null) {
+            item.setParent(this);
+        }
+        this.items.add(item);
+    }
+
+    public void addItem(SQLExpr item) {
+        addItem(new SQLSelectOrderByItem(item));
+    }
+
+    public List<SQLSelectOrderByItem> getItems() {
+        return this.items;
+    }
+    
+    public boolean isSibings() {
+        return this.sibings;
+    }
+
+    public void setSibings(boolean sibings) {
+        this.sibings = sibings;
+    }
+
+    protected void accept0(SQLASTVisitor v) {
+        if (v.visit(this)) {
+            for (int i = 0; i < this.items.size(); i++) {
+                final SQLSelectOrderByItem item = this.items.get(i);
+                item.accept(v);
+            }
+        }
+
+        v.endVisit(this);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        SQLZOrderBy order = (SQLZOrderBy) o;
+
+        if (sibings != order.sibings) return false;
+        return items.equals(order.items);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = items.hashCode();
+        result = 31 * result + (sibings ? 1 : 0);
+        return result;
+    }
+
+    public void addItem(SQLExpr expr, SQLOrderingSpecification type) {
+        SQLSelectOrderByItem item = createItem();
+        item.setExpr(expr);
+        item.setType(type);
+        addItem(item);
+    }
+
+    @Override
+    public boolean replace(SQLExpr expr, SQLExpr target) {
+
+        for (SQLSelectOrderByItem item : items) {
+            if(item.replace(expr, target)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    protected SQLSelectOrderByItem createItem() {
+        return new SQLSelectOrderByItem();
+    }
+
+    public SQLZOrderBy clone() {
+        SQLZOrderBy x = new SQLZOrderBy();
+
+        for (SQLSelectOrderByItem item : items) {
+            SQLSelectOrderByItem item1 = item.clone();
+            item1.setParent(x);
+            x.items.add(item1);
+        }
+
+        x.sibings = sibings;
+
+        return x;
+    }
+}
diff --git a/src/main/java/com/alibaba/druid/sql/ast/statement/SQLPurgeTemporaryOutputStatement.java b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLPurgeTemporaryOutputStatement.java
new file mode 100644
index 0000000000..98786da184
--- /dev/null
+++ b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLPurgeTemporaryOutputStatement.java
@@ -0,0 +1,54 @@
+/*
+ * 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.ast.statement;
+
+import com.alibaba.druid.DbType;
+import com.alibaba.druid.sql.ast.SQLExpr;
+import com.alibaba.druid.sql.ast.SQLName;
+import com.alibaba.druid.sql.ast.SQLStatementImpl;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+public class SQLPurgeTemporaryOutputStatement extends SQLStatementImpl implements SQLDropStatement {
+    private SQLName name;
+
+    public SQLPurgeTemporaryOutputStatement() {
+
+    }
+
+    public SQLPurgeTemporaryOutputStatement(DbType dbType) {
+        super (dbType);
+    }
+
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        if (visitor.visit(this)) {
+            acceptChild(visitor, name);
+        }
+        visitor.endVisit(this);
+    }
+
+    public SQLName getName() {
+        return name;
+    }
+
+    public void setName(SQLName x) {
+        if (x != null) {
+            x.setParent(this);
+        }
+        this.name = x;
+    }
+
+}
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/odps/ast/OdpsInstallPackageStatement.java b/src/main/java/com/alibaba/druid/sql/dialect/odps/ast/OdpsInstallPackageStatement.java
new file mode 100644
index 0000000000..b06d697703
--- /dev/null
+++ b/src/main/java/com/alibaba/druid/sql/dialect/odps/ast/OdpsInstallPackageStatement.java
@@ -0,0 +1,27 @@
+package com.alibaba.druid.sql.dialect.odps.ast;
+
+import com.alibaba.druid.sql.ast.SQLName;
+import com.alibaba.druid.sql.dialect.odps.visitor.OdpsASTVisitor;
+
+public class OdpsInstallPackageStatement extends OdpsStatementImpl {
+    private SQLName packageName;
+
+    @Override
+    protected void accept0(OdpsASTVisitor v) {
+        if (v.visit(this)) {
+            acceptChild(v, packageName);
+        }
+        v.endVisit(this);
+    }
+
+    public SQLName getPackageName() {
+        return packageName;
+    }
+
+    public void setPackageName(SQLName x) {
+        if (x != null) {
+            x.setParent(this);
+        }
+        this.packageName = x;
+    }
+}