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From: zuyu <git@git.apache.org>
To: dev@quickstep.incubator.apache.org
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References: <git-pr-229-incubator-quickstep@git.apache.org>
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Subject: [GitHub] incubator-quickstep pull request #229: Implement parser and resolver for UNI...
Content-Type: text/plain
Message-Id: <20170407021728.299CCF21A4@git1-us-west.apache.org>
Date: Fri,  7 Apr 2017 02:17:28 +0000 (UTC)
archived-at: Fri, 07 Apr 2017 02:17:33 -0000

Github user zuyu commented on a diff in the pull request:

    https://github.com/apache/incubator-quickstep/pull/229#discussion_r110295303
  
    --- Diff: parser/ParseSetOperation.hpp ---
    @@ -0,0 +1,136 @@
    +/**
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you 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.
    + **/
    +
    +#ifndef QUICKSTEP_PARSER_PARSE_SET_OPERATION_HPP_
    +#define QUICKSTEP_PARSER_PARSE_SET_OPERATION_HPP_
    +
    +#include <string>
    +#include <vector>
    +
    +#include "parser/ParseTreeNode.hpp"
    +#include "utility/Macros.hpp"
    +#include "utility/PtrList.hpp"
    +
    +namespace quickstep {
    +
    +/** \addtogroup Parser
    + *  @{
    + */
    +
    +/**
    + * @brief A parsed representation of set operations.
    + */
    +class ParseSetOperation : public ParseTreeNode {
    + public:
    +  /**
    +   * @brief The possible types of set operations.
    +   */
    +  enum SetOperationType {
    +    kIntersect,
    +    kSingle,
    --- End diff --
    
    Question: does `kSingle` has an extra meaning beyond representing a `SELECT` query?


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