sql parser support with subquery, orginaize testcase code imports

src/main/java/com/alibaba/druid/sql/ast/statement/SQLSelect.java

@@ -21,15 +21,24 @@ import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
 public class SQLSelect extends SQLObjectImpl {
 
-    private static final long serialVersionUID = 1L;
+    private static final long     serialVersionUID = 1L;
 
-    protected SQLSelectQuery  query;
-    protected SQLOrderBy      orderBy;
+    protected SQLWithSubqueryClause withSubQuery;
+    protected SQLSelectQuery      query;
+    protected SQLOrderBy          orderBy;
 
     public SQLSelect(){
 
     }
 
+    public SQLWithSubqueryClause getWithSubQuery() {
+        return withSubQuery;
+    }
+
+    public void setWithSubQuery(SQLWithSubqueryClause withSubQuery) {
+        this.withSubQuery = withSubQuery;
+    }
+
     public SQLSelectQuery getQuery() {
         return this.query;
     }

src/main/java/com/alibaba/druid/sql/ast/statement/SQLWithSubqueryClause.java

@@ -0,0 +1,91 @@
+/*
+ * 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.statement;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.alibaba.druid.sql.ast.SQLName;
+import com.alibaba.druid.sql.ast.SQLObjectImpl;
+import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+public class SQLWithSubqueryClause extends SQLObjectImpl {
+
+    private static final long serialVersionUID = 1L;
+
+    private Boolean           recursive;
+    private final List<Entry> entries          = new ArrayList<Entry>();
+
+    public List<Entry> getEntries() {
+        return entries;
+    }
+
+    public Boolean getRecursive() {
+        return recursive;
+    }
+
+    public void setRecursive(Boolean recursive) {
+        this.recursive = recursive;
+    }
+
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        if (visitor.visit(this)) {
+            acceptChild(visitor, entries);
+        }
+        visitor.endVisit(this);
+    }
+
+    public static class Entry extends SQLObjectImpl {
+
+        private static final long     serialVersionUID = 1L;
+        protected SQLIdentifierExpr   name;
+        protected final List<SQLName> columns          = new ArrayList<SQLName>();
+        protected SQLSelectQuery      subQuery;
+
+        @Override
+        protected void accept0(SQLASTVisitor visitor) {
+            if (visitor.visit(this)) {
+                acceptChild(visitor, name);
+                acceptChild(visitor, columns);
+                acceptChild(visitor, subQuery);
+            }
+            visitor.endVisit(this);
+        }
+
+        public SQLIdentifierExpr getName() {
+            return name;
+        }
+
+        public void setName(SQLIdentifierExpr name) {
+            this.name = name;
+        }
+
+        public SQLSelectQuery getSubQuery() {
+            return subQuery;
+        }
+
+        public void setSubQuery(SQLSelectQuery subQuery) {
+            this.subQuery = subQuery;
+        }
+
+        public List<SQLName> getColumns() {
+            return columns;
+        }
+
+    }
+}