Oracle支持GroupingSets Clause

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@155 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/main/java/com/alibaba/druid/sql/ast/expr/SQLListExpr.java

@@ -0,0 +1,27 @@
+package com.alibaba.druid.sql.ast.expr;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.alibaba.druid.sql.ast.SQLExpr;
+import com.alibaba.druid.sql.ast.SQLExprImpl;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+public class SQLListExpr extends SQLExprImpl {
+
+    private static final long   serialVersionUID = 1L;
+    
+    private final List<SQLExpr> items            = new ArrayList<SQLExpr>();
+
+    public List<SQLExpr> getItems() {
+        return items;
+    }
+
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        if (visitor.visit(this)) {
+            acceptChild(visitor, items);
+        }
+        visitor.endVisit(this);
+    }
+}