LogicalUnionNode.cs

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// 
//  Copyright 2010-2015 Deveel
// 
//    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.
//

using System;

using Deveel.Data.Serialization;
using Deveel.Data.Sql.Tables;

namespace Deveel.Data.Sql.Query {
    [Serializable]
    class LogicalUnionNode : BranchQueryPlanNode {
        public LogicalUnionNode(IQueryPlanNode left, IQueryPlanNode right) 
            : base(left, right) {
        }

        private LogicalUnionNode(ObjectData data)
            : base(data) {
        }

        public override ITable Evaluate(IRequest context) {
            var leftResult = Left.Evaluate(context);
            var rightResult = Right.Evaluate(context);

            return leftResult.Union(rightResult);
        }
    }
}